libertas: configurable beacon interval

Requires firmware version 5.110.19.p0 or newer, available here:
http://dev.laptop.org/pub/firmware/libertas/

Signed-off-by: Ashish Shukla <ashishs@marvell.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: Dan Williams <dcbw@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/libertas/dev.h b/drivers/net/wireless/libertas/dev.h
index 433b9bd..53776bc 100644
--- a/drivers/net/wireless/libertas/dev.h
+++ b/drivers/net/wireless/libertas/dev.h
@@ -263,6 +263,8 @@
 	struct list_head network_free_list;
 	struct bss_descriptor *networks;
 
+	u16 beacon_period;
+	u8 beacon_enable;
 	u8 adhoccreate;
 
 	/** capability Info used in Association, start, join */