qaic: allow user to pass timeout for wait_exec call

Currently we have a fixed wait exec timeout of 5 sec. It can
additionally be controlled using module parameter. This patch allows
user to provide dynamic timeout for each wait call.

Change-Id: I81525698886ea2253642956397f3d5196d209d6f
Signed-off-by: Pratyush Anand <pratanan@codeaurora.org>
Signed-off-by: Pratyush Anand <pratanan@codeaurora.org>