msm: camera2: cpp: Change bus scale vector call sequence

The cpp driver can set the bus scale vector when cpp module is
actually included. This will avoid unnecessary power consumption
due to setting the bus scale vector.

Change-Id: I898bb33f4433d8b70f63c07facd6e22d58196211
Signed-off-by: Rajakumar Govindaram <rajakuma@codeaurora.org>