Allow building of an OEM friendly TWRP

Disable theming
Disable creating the TWRP folder for the settings file
Change factory reset on data/media devices to a full wipe

Change-Id: I3104282b5dd3f55dfff7c8cf39c72750af08563d
diff --git a/Android.mk b/Android.mk
index 7ac4d41..c54f8c0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -278,6 +278,9 @@
 ifneq ($(wildcard bionic/libc/include/sys/capability.h),)
     LOCAL_CFLAGS += -DHAVE_CAPABILITIES
 endif
+ifeq ($(TW_OEM_BUILD),true)
+    LOCAL_CFLAGS += -DTW_OEM_BUILD
+endif
 
 include $(BUILD_EXECUTABLE)