msm: adsprpc: Validate the CID

Validating the CID is a valid channel number.

Change-Id: Ia30c084801795882a24462fe0b9b4200a7084228
Acked-by: Ranjith Goud Namala <rnamala@qti.qualcomm.com>
Signed-off-by: Vamsi Krishna Gattupalli <quic_vgattupa@quicinc.com>