staging: wilc1000: remove wilc_add_tx_gtk declaration

This patch deletes wilc_add_tx_gtk declaration. It is not find
wilc_add_tx_gtk definition in this driver.
Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.h

@@ -321,8 +321,6 @@ int wilc_add_rx_gtk(struct wilc_vif *vif, const u8 *rx_gtk, u8 gtk_key_len,
 		    u8 index, u32 key_rsc_len, const u8 *key_rsc,
 		    const u8 *rx_mic, const u8 *tx_mic, u8 mode,
 		    u8 cipher_mode);
-s32 wilc_add_tx_gtk(struct host_if_drv *hWFIDrv, u8 u8KeyLen,
-			u8 *pu8TxGtk, u8 u8KeyIdx);
 s32 wilc_set_pmkid_info(struct wilc_vif *vif,
 			struct host_if_pmkid_attr *pu8PmkidInfoArray);
 s32 wilc_get_mac_address(struct wilc_vif *vif, u8 *pu8MacAddress);