iwlwifi: mvm: add Asus to the PPAG approved list

Asus is now approved to use the PPAG feature.  Add it to the approved
list.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210131201908.fae78b768080.Id649ccc8f3b923be2618ad44cd4f7732871e1469@changeid


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