P2P: Allow P2P functionality to be disabled per interface

By default, P2P is initialized for all driver interfaces and this makes
P2P getting initialized for non-P2P station interface if the supplicant
is started first on this interface. If an interface is dedicated for
non-P2P station mode, it is now possible to disable P2P initialization
by adding 'p2p_disabled=1' in the configuration file of non-P2P station
interface, irrespective of the order in which supplicant is started.

Signed-hostap: Sreenath Sharma <sreenats@broadcom.com>

wpa_supplicant/p2p_supplicant.c

@@ -3114,6 +3114,9 @@ int wpas_p2p_init(struct wpa_global *global, struct wpa_supplicant *wpa_s)
 	unsigned int r;
 	int i;
 
+	if (wpa_s->conf->p2p_disabled)
+		return 0;
+
 	if (!(wpa_s->drv_flags & WPA_DRIVER_FLAGS_P2P_CAPABLE))
 		return 0;