libertas: remove unused Automatic Frequency Control command

It hasn't been hooked up to anything in a long time and it's not
even listed in any of the firmware documentation I have (and I
have v5.1, v8, v9, and v10).

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 f877bb8..782fd15 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -882,7 +882,10 @@
 	u8 data[256];
 } __packed;
 
+/* Automatic Frequency Control */
 struct cmd_ds_802_11_afc {
+	struct cmd_header hdr;
+
 	__le16 afc_auto;
 	union {
 		struct {
@@ -965,7 +968,6 @@
 		struct cmd_ds_bbp_reg_access bbpreg;
 		struct cmd_ds_rf_reg_access rfreg;
 
-		struct cmd_ds_802_11_afc afc;
 		struct cmd_ds_802_11_led_ctrl ledgpio;
 
 		struct cmd_ds_bt_access bt;