MIPS: bootm: add support for generic relocation of init ramdisks

All linux kernels after v2.6 require a page-aligned location of
an external init ramdisk. Enable CONFIG_SYS_BOOT_RAMDISK_HIGH to
support this with the generic U-Boot relocation code.

Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
diff --git a/arch/mips/include/asm/config.h b/arch/mips/include/asm/config.h
index 6eb1cee..3a891ba 100644
--- a/arch/mips/include/asm/config.h
+++ b/arch/mips/include/asm/config.h
@@ -8,5 +8,6 @@
 #define _ASM_CONFIG_H_
 
 #define CONFIG_LMB
+#define CONFIG_SYS_BOOT_RAMDISK_HIGH
 
 #endif