global: Migrate CONFIG_MAX_MEM_MAPPED to CFG

Perform a simple rename of CONFIG_MAX_MEM_MAPPED to CFG_MAX_MEM_MAPPED

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/powerpc/include/asm/config.h b/arch/powerpc/include/asm/config.h
index 983c6f7..f0702ca 100644
--- a/arch/powerpc/include/asm/config.h
+++ b/arch/powerpc/include/asm/config.h
@@ -14,13 +14,13 @@
   #define HWCONFIG_BUFFER_SIZE 256
 #endif
 
-#ifndef CONFIG_MAX_MEM_MAPPED
+#ifndef CFG_MAX_MEM_MAPPED
 #if	defined(CONFIG_E500)		|| \
 	defined(CONFIG_MPC86xx)		|| \
 	defined(CONFIG_E300)
-#define CONFIG_MAX_MEM_MAPPED	((phys_size_t)2 << 30)
+#define CFG_MAX_MEM_MAPPED	((phys_size_t)2 << 30)
 #else
-#define CONFIG_MAX_MEM_MAPPED	(256 << 20)
+#define CFG_MAX_MEM_MAPPED	(256 << 20)
 #endif
 #endif