common_cs.h: mv gsm_encr to gsm_data.h

This leaves common_cs.h practically empty. Leave its removal to the next patch,
which removes libcommon-cs entirely
(I07d4a48af3154ee4d904686f230a51b8b8a94ff9).

Change-Id: Ic3233f03580aa8c0ab178dfd33e68ecab5b9f042
2 files changed