Read the UNII4 setting from the ACPI table and use it in the
LARI_CONFIG_CHANGE_CMD accordingly.

This setting allows OEMs to enable or disable UNII4, bypassing the FW
defaults.
Signed-off-by: Abhishek Naik <abhishek.naik@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210617100544.223090c509c4.If03cb5393607ae494041b6187bcec134d6a1e06d@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>