global: Migrate CONFIG_FSL_PMIC_BITLEN to CFG

Perform a simple rename of CONFIG_FSL_PMIC_BITLEN to CFG_FSL_PMIC_BITLEN

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/include/configs/mx51evk.h b/include/configs/mx51evk.h
index 8ab1ee7..d4cca8d 100644
--- a/include/configs/mx51evk.h
+++ b/include/configs/mx51evk.h
@@ -25,7 +25,7 @@
 #define CONFIG_FSL_PMIC_CS	0
 #define CONFIG_FSL_PMIC_CLK	2500000
 #define CONFIG_FSL_PMIC_MODE	(SPI_MODE_0 | SPI_CS_HIGH)
-#define CONFIG_FSL_PMIC_BITLEN	32
+#define CFG_FSL_PMIC_BITLEN	32
 
 /*
  * MMC Configs