MX51EVK: Use SWx macros in PMIC init

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
diff --git a/board/freescale/mx51evk/mx51evk.c b/board/freescale/mx51evk/mx51evk.c
index 7c50c54..02a765d 100644
--- a/board/freescale/mx51evk/mx51evk.c
+++ b/board/freescale/mx51evk/mx51evk.c
@@ -198,17 +198,17 @@
 
 	/* Set core voltage to 1.1V */
 	val = pmic_reg_read(REG_SW_0);
-	val = (val & (~0x1F)) | 0x14;
+	val = (val & ~SWx_VOLT_MASK) | SWx_1_100V;
 	pmic_reg_write(REG_SW_0, val);
 
 	/* Setup VCC (SW2) to 1.25 */
 	val = pmic_reg_read(REG_SW_1);
-	val = (val & (~0x1F)) | 0x1A;
+	val = (val & ~SWx_VOLT_MASK) | SWx_1_250V;
 	pmic_reg_write(REG_SW_1, val);
 
 	/* Setup 1V2_DIG1 (SW3) to 1.25 */
 	val = pmic_reg_read(REG_SW_2);
-	val = (val & (~0x1F)) | 0x1A;
+	val = (val & ~SWx_VOLT_MASK) | SWx_1_250V;
 	pmic_reg_write(REG_SW_2, val);
 	udelay(50);