platform: msm_shared: Move the regulator APIs to target specifc files.

Make the regulator APIs target specific so that custom regulators can be enabled.

Change-Id: I63f97af6b4aa3d40a68f5840129227fdca4a079f
diff --git a/platform/msm_shared/rules.mk b/platform/msm_shared/rules.mk
index 9d9196c..d6e048a 100755
--- a/platform/msm_shared/rules.mk
+++ b/platform/msm_shared/rules.mk
@@ -19,8 +19,7 @@
 ifeq ($(ENABLE_SMD_SUPPORT),1)
 OBJS += \
 	$(LOCAL_DIR)/rpm-smd.o \
-	$(LOCAL_DIR)/smd.o \
-	$(LOCAL_DIR)/regulator.o
+	$(LOCAL_DIR)/smd.o
 endif
 
 ifeq ($(ENABLE_SDHCI_SUPPORT),1)