hardware_samsung: Add RIL subclass for Exynos4 GSM

Also updated RIL for Lollipop. Fixes sim unlock with PIN code.

I'm still unsure whether this should be merged or not:
https://github.com/CyanogenMod/android_device_samsung_klte/commit/2864552a9399bf31ecfa294b2d97838b5a14353f

Change-Id: Ia9db4cfad07ab58b1d82baffc4b7f44d4c837ae8
gralloc: fix find_last_rect()

Change-Id: I4850a0a848c0c859be1e0b3b0ff8e280ba63af0b