libertas: implement function init/shutdown commands for SD8688

SD8688 is a WLAN/Bluetooth combo chip and both functions are supported
in a single firmware image. FUNC_INIT and FUNC_SHUTDOWN commands are
implemented to utilize the multiple function feature.

When SD8688 card is inserted, the firmware image should be downloaded
only once through either WLAN function (Libertas driver) or Bluetooth
function (Bluetooth driver).

This patch adds function init/shutdown for SD8688 WLAN function only.

Signed-off-by: Bing Zhao <bzhao@marvell.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 8ff8ac9..fe8f0cb 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -86,6 +86,8 @@
 #define CMD_MESH_CONFIG_OLD			0x00a3
 #define CMD_MESH_CONFIG				0x00ac
 #define	CMD_SET_BOOT2_VER			0x00a5
+#define	CMD_FUNC_INIT				0x00a9
+#define	CMD_FUNC_SHUTDOWN			0x00aa
 #define CMD_802_11_BEACON_CTRL			0x00b0
 
 /* For the IEEE Power Save */