ARM: uniphier: set dram_base environment variable

The base of DRAM will be changed for the next generation SoC.

Set the base address to the 'dram_base' environment variable, which
will be useful for scripting.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

arch/arm/mach-uniphier/board_late_init.c

@@ -135,6 +135,8 @@ int board_late_init(void)
 
 	uniphier_set_env_fdt_file();
 
+	uniphier_set_env_addr("dram_base", NULL);
+
 	uniphier_set_env_addr("loadaddr", "loadaddr_offset");
 
 	return 0;