iwlwifi: mvm: set the default cTDP budget

In case there is no value received from BIOS
for cTDP budget, the default should be 2000 mWatt.

Signed-off-by: Chaya Rachel Ivgi <chaya.rachel.ivgi@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>