iwlwifi: pcie: identify the RF module

Identify and print out the RF module to be able to identify
(from logs and through debugfs) which one (and version) is
present on the system.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210617100544.cd1ef97b2c04.Iad42a59902a87a50b45b9ce88705863686a83b54@changeid


Signed-off-by: Luca Coelho <luciano.coelho@intel.com>