global: Migrate CONFIG_MAX_RAM_BANK_SIZE to CFG

Perform a simple rename of CONFIG_MAX_RAM_BANK_SIZE to CFG_MAX_RAM_BANK_SIZE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/rut.h b/include/configs/rut.h
index 99799f8..4002bc4 100644
--- a/include/configs/rut.h
+++ b/include/configs/rut.h
@@ -19,7 +19,7 @@
 #define DDR_PLL_FREQ	303
 
  /* Physical Memory Map */
-#define CONFIG_MAX_RAM_BANK_SIZE	(256 << 20) /* 256 MiB */
+#define CFG_MAX_RAM_BANK_SIZE	(256 << 20) /* 256 MiB */
 
 /* Watchdog */
 #define WATCHDOG_TRIGGER_GPIO	14