ARM: add flat device tree support

Based on other architectures already supported.
Tested on OMAP3 Beagle board and another unnamed ARM platform.

Signed-off-by: John Rigby <john.rigby@linaro.org>
Tested-by: Rob Herring <rob.herring@smooth-stone.com>
Acked-by: Wolfgang Denk <wd@denx.de>
diff --git a/arch/arm/include/asm/config.h b/arch/arm/include/asm/config.h
index 4e8dfd7..d8e33fc 100644
--- a/arch/arm/include/asm/config.h
+++ b/arch/arm/include/asm/config.h
@@ -25,4 +25,6 @@
 /* Relocation to SDRAM works on all ARM boards */
 #define CONFIG_RELOC_FIXUP_WORKS
 #endif
+#define CONFIG_LMB
+#define CONFIG_SYS_BOOT_RAMDISK_HIGH
 #endif