iwlmvm: tdls: Check TDLS channel switch support

Some versions of the FW don't support channel switch in TDLS.
Add a condition that checks it.

Fixes: 307e4723 ("iwlwifi: mvm: configure TDLS peers to FW")
Signed-off-by: Aviya Erenfeld <aviya.erenfeld@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>