wifi: iwlwifi: add support for additional channels in NVM_GET_INFO

wifi: iwlwifi: add support for additional channels in NVM_GET_INFO

We need to expect more channels on devices that support UNII-9.
Since iwl_ext_nvm_channels and iwl_uhb_nvm_channels are just a prefix
of iwl_unii9_nvm_channels just use iwl_unii9_nvm_channels and modify the
number of channels if the device does not support UNII-9 channels.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://patch.msgid.link/20260715215523.473f48e6135d.I0e93cda753558aa4d9e3efcdd52cbc2eb9302c4a@changeid