wifi: iwlmei: send driver down SAP message only if wiamt is enabled

When wiamt is disabled the driver up SAP message is not sent, so
there is no need to send the driver down message as well.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>
Link: https://lore.kernel.org/r/20230822103048.100f41b84656.I583d3e18ea65793f53aa710af13e47f8af82b53d@changeid


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