dev: pmic: add regulator base addresses used by 8226 display.

Add LDO4/LDO8/LDO15 regulator base addresses which are used
to supply power to DSI PHY and the display panel on msm8226.

Change-Id: I8cffe4745c00c6d750664609f33a7f4f46b89cb2
diff --git a/dev/pmic/pm8x41/include/pm8x41.h b/dev/pmic/pm8x41/include/pm8x41.h
index 3678bea..f934aa0 100644
--- a/dev/pmic/pm8x41/include/pm8x41.h
+++ b/dev/pmic/pm8x41/include/pm8x41.h
@@ -91,8 +91,10 @@
 /* LDO base addresses. */
 #define PM8x41_LDO2                           0x14100
 #define PM8x41_LDO4                           0x14300
+#define PM8x41_LDO8                           0x14700
 #define PM8x41_LDO12                          0x14B00
 #define PM8x41_LDO14                          0x14D00
+#define PM8x41_LDO15                          0x14E00
 #define PM8x41_LDO19                          0x15200
 #define PM8x41_LDO22                          0x15500