Add Theme Engine to the builds

Change-Id: I57568ebef3f9800e0ad7c39b6352186470ad9f08
diff --git a/config/common.mk b/config/common.mk
index f6ab3f8..add3264 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -72,6 +72,9 @@
 PRODUCT_COPY_FILES += \
     vendor/cm/prebuilt/common/etc/mkshrc:system/etc/mkshrc
 
+# T-Mobile theme engine
+include vendor/cm/config/themes_common.mk
+
 # Required CM packages
 PRODUCT_PACKAGES += \
     Camera \