wifi: iwlwifi: debugfs: add ppag capa to fw info file

Add information about ppag_china_bit_support capability.

Signed-off-by: Alon Giladi <alon.giladi@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230612184434.4655922aff4d.Ie934027940bd53d05124222aa6a8a8b7021952c4@changeid


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