Revert "Add target specific option to skip wallpapers from build"

This reverts commit a185fd8b356995fa22da05ce9b5d384758411762.
This commit is broken and disables wallpapers and themes on anything
under vega (zeppelin, zero for example)

products/common.mk

@@ -37,16 +37,11 @@ PRODUCT_PACKAGES += \
     CMParts \
     CMStats \
     CMUpdateNotify \
+    CMWallpapers \
     DSPManager \
     libcyanogen-dsp \
     Pacman
 
-# make wallpapers optional for low-storage-devices
-ifneq ($(PRODUCT_SKIP_WALLPAPERS),true)
-PRODUCT_PACKAGES += \
-    CMWallpapers
-endif
-
 # Extra tools in CyanogenMod
 PRODUCT_PACKAGES += \
     openvpn

products/cyanogen_vega.mk

@@ -1,8 +1,7 @@
 $(call inherit-product, device/advent/vega/vega.mk)
 
-# skips themes and wallpaper to keep the resulting rom tiny so it fits on /system/ with all languages included
-PRODUCT_SKIP_THEMES=true
-PRODUCT_SKIP_WALLPAPERS=true
+# skips themes and keeps the resulting rom tiny so it fits on /system/ with all languages included
+PRODUCT_SPECIFIC_DEFINES += SKIP_THEMES=true
 
 # Inherit some common cyanogenmod stuff.
 $(call inherit-product, vendor/cyanogen/products/common_full.mk)

products/themes.mk

@@ -1,6 +1,6 @@
 # Theme packages
 
-ifneq ($(PRODUCT_SKIP_THEMES),true)
+ifneq ($(SKIP_THEMES),true)
 PRODUCT_PACKAGES += \
        Androidian \
        Cyanbread