Revert "msm_ipc_router: Allow processes in the sensors group to use it freely"

This reverts commit 4c476675a96e677938f94dcd351c3a0bfca0b795.

Change-Id: I2ff30ae04b3e227ce2a7163f405449d38316a7d0
Merge "Revert "msm_ipc_router: Allow processes in the sensors group to use it freely"" into kitkat