drivers: wifi: nxp: add Kconfig of NXP_WIFI_AUTO_INIT

Automatically initialize NXP Wi-Fi driver and FW for Wi-Fi networking
operation. Disable this setting if Wi-Fi module will be used for
non-Wi-Fi use cases (manufacturing/calibration/test).

Signed-off-by: Maochen Wang <maochen.wang@nxp.com>