build: recovery: Support target specific resource selection

 * Allow resources matching the target screen width to override the
   default resources.
 * Allow overriding screen width for recovery.

Change-Id: I979b6e74cfd1fe66c798de02bcd908d22731494a
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_build into cm-11.0