msm: camera2: cpp: adjust poll time

The current poll value is very high in the order of ms. The
MICRO is capable of handling commands faster than current
delay between each poll read. This change optimize the latency
between each poll read to be in the order of microseconds.

Change-Id: I866cca1ea0642461979c51bd7391a147df457674
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>