network: wireless: Add get_mac_addr functionality to platform

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

include/linux/wlan_plat.h

@@ -20,6 +20,7 @@ struct wifi_platform_data {
 	int (*set_reset)(int val);
 	int (*set_carddetect)(int val);
 	void *(*mem_prealloc)(int section, unsigned long size);
+	int (*get_mac_addr)(unsigned char *buf);
 };
 
 #endif