wifi: iwlwifi: mvm: don't set CHECKSUM_COMPLETE for unsupported protocols

On Bz devices, CHECKSUM_COMPLETE was set for unsupported protocols
which results in a warning. Fix it.

Fixes: b6f5b647 ("iwlwifi: mvm: handle RX checksum on Bz devices")
Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230413102635.a2a35286f0ca.I50daa9445a6465514c44f5096c32adef64beba5f@changeid


Signed-off-by: Johannes Berg <johannes.berg@intel.com>