wifi: iwlwifi: cfg: clean up Bz module firmware lines

Remove module firmware lines for images that don't exist
as well as some unused macros, and add gl-a-fm-a that
(still) exists.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230621130444.b399b0072d72.Ie7ca1b3dcdebc929ce96a739e0d557fac2c8aeeb@changeid


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