kernel: driver: Added support msm_smd_pkt driver

msm_smd_pkt driver provides data communication to
remote peripherals such as Modem over RPMSG.

Change-Id: I8d05786214620e11fb6b372b9b28ba70d5fecc4e
Signed-off-by: Santosh Kumar M <santhoshm@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>