rpmsg: glink: Initialize the "intent_req_comp" completion variable

The "intent_req_comp" variable is used without initialization which
results in NULL pointer dereference in qcom_glink_request_intent().

we need to initialize the completion variable before using it.

Change-Id: Ib5ad484ddaa0b1b2e13e4b098475ab04ea8fbd44
Fixes: 27b9c5b6 ("rpmsg: glink: Request for intents when unavailable")
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>
Signed-off-by: Chris Lew <clew@codeaurora.org>