iwlwifi: mvm: move all LMAC scan flags into a single funtion

Having an LMAC counterpart for the existing UMAC flags function makes
things more consistent and easy to compare and spot the differences.
The flags are the same, but are in different bits, so unfortunately we
can't use a single function for both APIs.

Signed-off-by: Luciano Coelho <luciano.coelho@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>