cnss2: Add support for configuring calibration duration

Add support for configuring cold boot calibration duration if
the param qcom,cnss-cal-duration is present in the dt node.

Change-Id: Iafb336e004423e33da611b14b663cbe5d4aa4aa6
Signed-off-by: Jayachandran Sreekumaran <quic_jsreekum@quicinc.com>