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
allow to set tool extensions specified by vendor

Change-Id: Ibbdbd539fa23054ac7f4311afa93cc9e18c845b5

Conflicts:
	core/Makefile

Conflicts:
	core/Makefile