staging: wilc1000: remove host_int_add_tx_gtk declaration

This patch removes host_int_add_tx_gtk declaration that is defined in
host_interface.h file. It can not find any host_int_add_tx_gtk
function definition in this driver so just remove it.
Signed-off-by: NChaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.h

@@ -322,8 +322,6 @@ int host_int_add_rx_gtk(struct host_if_drv *hif_drv, const u8 *rx_gtk,
 			u32 key_rsc_len, const u8 *key_rsc,
 			const u8 *rx_mic, const u8 *tx_mic,
 			u8 mode, u8 cipher_mode);
-s32 host_int_add_tx_gtk(struct host_if_drv *hWFIDrv, u8 u8KeyLen,
-			u8 *pu8TxGtk, u8 u8KeyIdx);
 s32 host_int_set_pmkid_info(struct host_if_drv *hWFIDrv,
 			    struct host_if_pmkid_attr *pu8PmkidInfoArray);
 s32 host_int_get_pmkid_info(struct host_if_drv *hWFIDrv, u8 *pu8PmkidInfoArray,