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: I699d60c4120422a60578104840a803a26cfed85f
Signed-off-by: Srinivas Ganji <sringanj@codeaurora.org>