vendor_cm: Add CMFileManagerThemes

This adds the CMFileManagerThemes project to build system, so dark theme
can be enable in CMFileManager.

Requires change http://review.cyanogenmod.org/#/c/26279/

Change-Id: I668bb5210647fddfcb9ee00b75825c7641127247

config/themes_common.mk

@@ -2,7 +2,8 @@
 PRODUCT_PACKAGES += \
        ThemeManager \
        ThemeChooser \
-       com.tmobile.themes
+       com.tmobile.themes \
+       CMFileManagerThemes
 
 PRODUCT_COPY_FILES += \
        vendor/cm/config/permissions/com.tmobile.software.themes.xml:system/etc/permissions/com.tmobile.software.themes.xml