msm: camera2: cpp: Reduce latency in open node

The MICRO block reset can be much shorter that current value.
The firmware version read can be done once during file name assocciation.
The firmware binary need not be dynamically loaded.

Change-Id: I42c706d278a9fc81d538d4172f7f286d5744c487
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>