mkshrc: remove post-install cmd and use LOCAL_MODULE_STEM

Change-Id: I2e0c7fda8cb39dd2a607f7ab2fdfe744e75fb3cd
diff --git a/prebuilt/Android.mk b/prebuilt/Android.mk
index 4d67e5b..0f5f091 100644
--- a/prebuilt/Android.mk
+++ b/prebuilt/Android.mk
@@ -526,12 +526,11 @@
 ifeq ($(TW_USE_TOOLBOX), true)
     include $(CLEAR_VARS)
     LOCAL_MODULE := mkshrc_twrp
+    LOCAL_MODULE_STEM := mkshrc
     LOCAL_MODULE_TAGS := eng
     LOCAL_MODULE_CLASS := ETC
     LOCAL_MODULE_PATH := $(TARGET_RECOVERY_ROOT_OUT)/etc
     LOCAL_SRC_FILES := $(LOCAL_MODULE)
-    LOCAL_POST_INSTALL_CMD := \
-        $(hide) mv $(TARGET_RECOVERY_ROOT_OUT)/etc/mkshrc_twrp $(TARGET_RECOVERY_ROOT_OUT)/etc/mkshrc
     include $(BUILD_PREBUILT)
 endif