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

Reduce the sleep time between subsequent polls to read HFI
register's status. This will reduce the time taken to disable
the CPU.

Change-Id: Ifd3c1dbe8b230d7364d774faed01d51cdddc14d2
Signed-off-by: Abhilash Kumar <krabhi@codeaurora.org>