arm: mvebu: Introduce mvebu-u-boot.dtsi for 32-bit Armada SoCs

Set u-boot,dm-pre-reloc for /soc/, /soc/internal-regs/ and &uart0 nodes as
it is required on every 32-bit Armada SoCs. And set also u-boot,dm-pre-reloc
for &spi0 when going to boot from SPI because otherwise SPL SPI drivers do
not load.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>

arch/arm/dts/mvebu-u-boot.dtsi

@@ -0,0 +1,24 @@
+#include <config.h>
+
+#ifdef CONFIG_ARMADA_32BIT
+
+/ {
+	soc {
+		u-boot,dm-pre-reloc;
+		internal-regs {
+			u-boot,dm-pre-reloc;
+		};
+	};
+};
+
+&uart0 {
+	u-boot,dm-pre-reloc;
+};
+
+#ifdef CONFIG_SPL_SPI
+&spi0 {
+	u-boot,dm-pre-reloc;
+};
+#endif
+
+#endif