rpmsg: glink: Changing interrupt trigger option

Adding IRQF_TRIGGER_RISING option for glink IN interrupt.
This option is required to receive interrupt from primary
host through virtual irq line.

Change-Id: Ib854e9fe9409690461b7a74b709c294f89cb3888
Signed-off-by: Arun Prakash <app@codeaurora.org>