iwlwifi: support SAR GEO Offset Mapping override via BIOS

Support reading the SAR Geographic Offset Mapping (SGOM) table from UEFI
to allow OEMs to override the values according to geographical regions.

Signed-off-by: Ayala Barazani <ayala.barazani@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20211204174546.e6dfd8b5dd40.Ibc9a8fe2bfde345f49df5d57ec56663da6a53dc4@changeid


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