msm: camera: icp: Reduce delay between subsequent A5 polls

Reduce the sleep time between subsequent polls while
trying to read the wfi register as part of A5 disable.
This will reduce the latency in the system while destroying
topology.

Change-Id: Id493fcc7158aba2632eba5bf6cfd44669c70382f
Signed-off-by: Karthik Anantha Ram <kartanan@codeaurora.org>