soc: qcom: glink: Initial version of G-Link Driver

G-Link is a generic link-layer transport similar to SMD that supports a
plug-in framework for the physical transport.  This allows it to adapt
to different physical transports such as shared memory, UARTs, buses,
and DMA.

Change-Id: I7c43ebff23a6f376672d10166b1e34e197ec06dd
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Eric Holmberg <eholmber@codeaurora.org>
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>
Signed-off-by: Steven Cahail <scahail@codeaurora.org>
Signed-off-by: Zaheerulla Meer <zmeer@codeaurora.org>
Signed-off-by: Atish Patra <apatra@codeaurora.org>