defconfig: msmcortex: Enable Glink

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

Change-Id: Iba346673a5d120bb456ce960bf99b100caa62a13
Signed-off-by: Jeffrey Hugo <jhugo@codeaurora.org>