ota_from_target_files: Don't update recovery image

(cherry picked from commit 6f9080b6a88dab99dd6fd3d4d283baaf57c7322e)

Conflicts:
	tools/releasetools/ota_from_target_files
build: Don't create recovery patch

Change-Id: I00a9ca268ed3f326a0fa5a913bc112ec8b290550
(cherry picked from commit ed13028290f660b3faf1a7f59811c2e6bb1178c8)

Conflicts:
	core/Makefile