iwlwifi: mvm: go to umac scan even if lmac tlv bit is on

LMAC TLV bit may be on in FWs that support UMAC scan; so check
for UMAC TLV bit first.

Signed-off-by: David Spinadel <david.spinadel@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>