cnss2: Wait for calibration to complete before registering driver

WLAN host driver may register to CNSS driver while device calibration
is going on. Registering driver shall wait for calibration to complete
for a certain time. Also prevent calibration started from driver side
if device is already active.

Change-Id: I7d5697fef007572fe15bfa0170555f5f83c44012
Signed-off-by: Yue Ma <yuem@codeaurora.org>