s4-common: use offmode charging blobs from m7

* Use offmode charging blobs from m7 (m7wlv OTA 5.28.605.2) to enable
  charging images support
* Shrink charging images from m7:
  - fireball/ville: 50% reduction (1080px --> 540px screen width)
  - evita/jewel: 66.67% reduction (1080px --> 720px screen width)

Change-Id: Ida40ad57ceb0fb5669f2adb840f31c7b0e242cca

Conflicts:
	recovery/Android.mk
	recovery/sbin/choice_fn
	recovery/sbin/detect_key
	recovery/sbin/offmode_charging
	recovery/sbin/power_test
	s4.mk