Move non-AOSP values to vendor_xxxxxx.xml

When merging in new version of android, xml resources
tend to have a lot of conflicts due to changes and
additions we've made so need to manage those changes
better.  By using additional xml resource files we can
group our changes without modifying the current AOSP
resources.

PS2:
Switch to using a ROM agnostic vendor_xxxxxx.xml naming.

Change-Id: I7cfe20e739091f2fd87d715ffe5ded6629dbde9f