zd1211rw: zd_mac: Add missing or incorrect function documentation

Fixes the following W=1 kernel build warning(s):

 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:433: warning: Function parameter or member 'hw' not described in 'zd_mac_tx_status'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:433: warning: Function parameter or member 'skb' not described in 'zd_mac_tx_status'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:433: warning: Function parameter or member 'tx_status' not described in 'zd_mac_tx_status'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:433: warning: Excess function parameter 'flags' description in 'zd_mac_tx_status'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:487: warning: Function parameter or member 'urb' not described in 'zd_mac_tx_failed'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:487: warning: Excess function parameter 'dev' description in 'zd_mac_tx_failed'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:927: warning: Function parameter or member 'hw' not described in 'zd_op_tx'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:927: warning: Excess function parameter 'dev' description in 'zd_op_tx'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:963: warning: Function parameter or member 'hw' not described in 'filter_ack'
 drivers/net/wireless/zydas/zd1211rw/zd_mac.c:963: warning: Excess function parameter 'dev' description in 'filter_ack'

Cc: Daniel Drake <dsd@gentoo.org>
Cc: Ulrich Kunitz <kune@deine-taler.de>
Cc: Kalle Valo <kvalo@codeaurora.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jakub Kicinski <kuba@kernel.org>
Cc: Michael Wu <flamingice@sourmilk.net>
Cc: "Luis R. Rodriguez" <mcgrof@winlab.rutgers.edu>
Cc: linux-wireless@vger.kernel.org
Cc: netdev@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/20200826093401.1458456-11-lee.jones@linaro.org