msm: camera: Add dynamic logging feature in camera

Change pr_warn and pr_warning to pr_debug and
define CDBG as pr_debug to support dynmaic logging feature.

Change-Id: I98f8b203d15b8df9fb2e65e5f4c63f1bec41a853
Signed-off-by: Yiduo Wang <yiduow@codeaurora.org>