modules: hostap: Add support of setting up softAP with hostapd

Added new flag CONFIG_WIFI_NM_HOSTAPD_AP for hostapd support. Once this
flag is enabled, softAP will be setup by hostapd. Both wpa_supplicant
and hostapd uses same task and eloop.
Included necessary hostapd files when compiling wifi samples if
CONFIG_WIFI_NM_HOSTAPD_AP is enabled. Added hostapd support for all
softAP command of L2 wifi shell commands.

Signed-off-by: Hui Bai <hui.bai@nxp.com>