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/host.h b/drivers/net/wireless/libertas/host.h
index 3746f702..256cac2 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -116,6 +116,8 @@
 
 #define CMD_SET_BOOT2_VER                 0x00a5
 
+#define CMD_802_11_BEACON_CTRL        0x00b0
+
 /* For the IEEE Power Save */
 #define CMD_SUBCMD_ENTER_PS               0x0030
 #define CMD_SUBCMD_EXIT_PS                0x0031