Convert CONFIG_ENV_IS_IN_MMC/NAND/UBI and NOWHERE to Kconfig

This converts the following to Kconfig:
   CONFIG_ENV_IS_IN_MMC
   CONFIG_ENV_IS_IN_NAND
   CONFIG_ENV_IS_IN_UBI
   CONFIG_ENV_IS_NOWHERE

In fact this already exists for sunxi as a 'choice' config. However not
all the choices are available in Kconfig yet so we cannot use that. It
would lead to more than one option being set.

In addition, one purpose of this series is to allow the environment to be
stored in more than one place. So the existing choice is converted to a
normal config allowing each option to be set independently.

There are not many opportunities for Kconfig updates to reduce the size of
this patch. This was tested with

   ./tools/moveconfig.py -i CONFIG_ENV_IS_IN_MMC

And then manual updates.  This is because for CHAIN_OF_TRUST boards they
can only have ENV_IS_NOWHERE set, so we enforce that via Kconfig logic
now.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

arch/arm/Kconfig

@@ -1022,6 +1022,7 @@ config ARCH_UNIPHIER
 	select SPL_PINCTRL if SPL
 	select SUPPORT_SPL
 	imply FAT_WRITE
+	imply ENV_IS_IN_MMC
 	help
 	  Support for UniPhier SoC family developed by Socionext Inc.
 	  (formerly, System LSI Business Division of Panasonic Corporation)

arch/arm/mach-exynos/Kconfig

@@ -8,6 +8,7 @@ config ARCH_EXYNOS4
 	bool "Exynos4 SoC family"
 	select CPU_V7
 	select BOARD_EARLY_INIT_F
+	imply ENV_IS_IN_MMC
 	help
 	  Samsung Exynos4 SoC family are based on ARM Cortex-A9 CPU. There
 	  are multiple SoCs in this family including Exynos4210, Exynos4412,

arch/arm/mach-imx/mx6/Kconfig

@@ -30,6 +30,7 @@ config MX6SL
 config MX6SX
 	select ROM_UNIFIED_SECTIONS
 	bool
+	imply ENV_IS_IN_MMC
 
 config MX6SLL
 	select ROM_UNIFIED_SECTIONS

arch/arm/mach-imx/mx7/Kconfig

@@ -13,6 +13,7 @@ config MX7D
 	select ROM_UNIFIED_SECTIONS
 	imply CMD_FUSE
 	bool
+	imply ENV_IS_IN_MMC
 
 choice
 	prompt "MX7 board select"

arch/arm/mach-sunxi/Kconfig

@@ -59,6 +59,7 @@ config MACH_SUNXI_H3_H5
 	select SUNXI_DRAM_DW_32BIT
 	select SUNXI_GEN_SUN6I
 	select SUPPORT_SPL
+	imply ENV_IS_IN_MMC
 
 choice
 	prompt "Sunxi SoC Variant"
@@ -70,6 +71,7 @@ config MACH_SUN4I
 	select ARM_CORTEX_CPU_IS_UP
 	select SUNXI_GEN_SUN4I
 	select SUPPORT_SPL
+	imply ENV_IS_IN_MMC
 
 config MACH_SUN5I
 	bool "sun5i (Allwinner A13)"
@@ -87,6 +89,7 @@ config MACH_SUN6I
 	select SUNXI_GEN_SUN6I
 	select SUPPORT_SPL
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
+	imply ENV_IS_IN_MMC
 
 config MACH_SUN7I
 	bool "sun7i (Allwinner A20)"
@@ -97,6 +100,7 @@ config MACH_SUN7I
 	select SUNXI_GEN_SUN4I
 	select SUPPORT_SPL
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
+	imply ENV_IS_IN_MMC
 
 config MACH_SUN8I_A23
 	bool "sun8i (Allwinner A23)"
@@ -107,6 +111,7 @@ config MACH_SUN8I_A23
 	select SUNXI_GEN_SUN6I
 	select SUPPORT_SPL
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
+	imply ENV_IS_IN_MMC
 
 config MACH_SUN8I_A33
 	bool "sun8i (Allwinner A33)"
@@ -132,6 +137,7 @@ config MACH_SUN8I_H3
 	select ARCH_SUPPORT_PSCI
 	select MACH_SUNXI_H3_H5
 	select ARMV7_BOOT_SEC_DEFAULT if OLD_SUNXI_KERNEL_COMPAT
+	imply ENV_IS_IN_MMC
 
 config MACH_SUN8I_R40
 	bool "sun8i (Allwinner R40)"

arch/arm/mach-tegra/Kconfig

@@ -60,6 +60,7 @@ config TEGRA_ARMV8_COMMON
 	bool "Tegra 64-bit common options"
 	select ARM64
 	select TEGRA_COMMON
+	imply ENV_IS_IN_MMC
 
 choice
 	prompt "Tegra SoC select"
@@ -77,6 +78,7 @@ config TEGRA30
 	select ARM_ERRATA_743622
 	select ARM_ERRATA_751472
 	select TEGRA_ARMV7_COMMON
+	imply ENV_IS_IN_MMC
 
 config TEGRA114
 	bool "Tegra114 family"
@@ -85,6 +87,7 @@ config TEGRA114
 config TEGRA124
 	bool "Tegra124 family"
 	select TEGRA_ARMV7_COMMON
+	imply ENV_IS_IN_MMC
 
 config TEGRA210
 	bool "Tegra210 family"

arch/mips/Kconfig

@@ -83,6 +83,7 @@ config ARCH_BMIPS
 	select CPU
 	select RAM
 	select SYSRESET
+	imply ENV_IS_NOWHERE
 
 config MACH_PIC32
 	bool "Support Microchip PIC32"