rpmsg: glink: Enable irq wake for glink interrupt

Enable irq wake option for glink interrupt to wake the
target from suspended state in case of any glink interrupt
from remote sub system.

Change-Id: I30b99c6841a341d49fadf4ee6cf218aeb6fb3a75
Signed-off-by: Arun Prakash <app@codeaurora.org>