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
(cherry picked from commit 85c54e892ba50d844f450114efcacf720007a034)
Revert "hardware_samsung: RIL: update xmm626x to make it work with the new rild"

This reverts commit d92c5bb2b892019e552460d870e17cba815f40f8.

(cherry picked from commit 4169d495db613d444d389c68fdc5f33d0c67b814)