wifi: Fix softAP turn-ON issue in statically loaded driver

SoftAP fails to turn-ON on some statically loaded driver
models in which the network interfaces are not available
until the firmware is reloaded in the AP mode. This change
provides the fix to load the firmware earlier in the softAP
start sequence to make wlan0 interface available.

b/22236507

Change-Id: If2c4b28c704bc6e5acb2be70d5d9d84d6e98f747