global: Migrate CONFIG_FLASH_BR_PRELIM to CFG

Perform a simple rename of CONFIG_FLASH_BR_PRELIM to CFG_FLASH_BR_PRELIM

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/p1_p2_rdb_pc.h b/include/configs/p1_p2_rdb_pc.h
index a353c16..f328eda 100644
--- a/include/configs/p1_p2_rdb_pc.h
+++ b/include/configs/p1_p2_rdb_pc.h
@@ -188,7 +188,7 @@
 #define CFG_SYS_FLASH_BASE_PHYS	CFG_SYS_FLASH_BASE
 #endif
 
-#define CONFIG_FLASH_BR_PRELIM (BR_PHYS_ADDR(CFG_SYS_FLASH_BASE_PHYS) \
+#define CFG_FLASH_BR_PRELIM (BR_PHYS_ADDR(CFG_SYS_FLASH_BASE_PHYS) \
 	| BR_PS_16 | BR_V)
 
 #define CONFIG_FLASH_OR_PRELIM	0xfc000ff7