msm: adsprpc: detect privileged processes based on group ID

Detect if the process is privileged by comparing its group ID with
an internal list obtained from the device-tree. Update the process
attributes sent to the remote subsystem accordingly.

Change-Id: I8d7b6824762b934ca6bd9a5d2420dc0dd49b7e6d
Acked-by: Thyagarajan Venkatanarayanan <venkatan@qti.qualcomm.com>
Signed-off-by: Edgar Flores <edgarf@codeaurora.org>