iwlwifi: fw: correctly detect HW-SMEM region subtype

This is part of the "device memory" type, but with the
subtypes we can now detect it properly, rather than
having to make assumptions on the ID.

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.20211204174546.91d33aa9dd3d.Ifb48e21fbb92ea25360856b5cc2afbb9b485d6b3@changeid


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