msm: ipa3: Assert the device if GSI event ring allocation fails

Add change to assert the device when GSI event
ring allocation fails.

Change-Id: Ifef81d183e0d8dd7f83f491f15c5f1ab971102a3
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>