xmm6262: Update using 4.3 libril.cpp

Change-Id: Ib884b46448b633b862cadb0f067e3180531858ae
xmm6262: Add Samsung ril.h header

Change-Id: I95e41483b342284c345f1be03e59d1e2b2d1ca75
xmm6262: Use xmm6262 libril for xmm6360 modem as well

* They appear to expose a very similar interface

Change-Id: I6793da25244258adb905e002d05bb60061487c5e