msm: camera: ife: Change data type for timeout

This commit changes the data type used to capture
wait for completion timeout return value from
integer type to the more appropriate unsigned
long type.

CRs-Fixed: 2620807
Change-Id: Ifcf54bdee133df5277ce56f0ba85442d32046eac
Signed-off-by: Venkat Chinta <vchinta@codeaurora.org>