cnss2: Allow WLAN driver register after cold boot calibration

When cold boot calibration is enabled, it is the first step in
WLAN initialization. Cold boot calibration is started post file
system mount from init.target.rc and wlan driver is
loaded after that.
This update is to reject wlan driver register if it is loaded
before cold boot calibration is complete. This ensures WLAN
init sequence triggered from init.target.rc is followed and wlan
driver load from early boot is rejected.

Change-Id: Id2d7b6f9ceed0d6d648012ad6d0c24bba4d09854
Signed-off-by: Manikandan Mohan <manikand@codeaurora.org>