diag: Process glink buffers in workqueue context

The patch initializes the glink buffers only to peripherals
supporting it and moves the handling of processing the data
received on glink buffers to process context.

CRs-Fixed: 2042362
Change-Id: I24522489ec5e499ff4ef97be0fef356a1671ec62
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>