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build fix: use ath_rx_desc for ah_setupRxDesc and ah_procRxDescFast, part 2

ar5416SetupRxDesc_20 and ar5416ProcRxDescFast_20 changed too.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: add ath_rx_bufhead and ath_tx_bufhead

Normally we have two working type of buffers tx and rx.
In some generic situations, for example ath_descdma_setup,
we do not really care about buffer type, here we can use
ath_bufhead.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: PHY_ADDR should be uint32

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: sc_txbuf_held is ath_tx_buf

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_flushrecv_tgt uses ath_rx_buffer

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: remove unused variable HAL_BUS_HANDLE sh

serie of function pass this vairiable but do not use it
on actual target.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: remove unused variable mem_start from ath_tgt_attach

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: remove non existing struct ath_softc

this struct is never declared, so remove it and
unused fucntion which used this struct.

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_buf_toggle should return ath_tx_buf

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: move some parts away from ATH_GENERIC_BUF

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_hal_filltxdesc should use ath_tx_desc

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_tx_desc

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_beacon_setup should use ath_tx_desc

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: use ath_tx_desc in ar5416SetupTxDesc_20

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: use ath_tx_desc in ar5416Set11nRateScenario_20

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: use ath_tx_decs in ar5416Set11nTxDesc_20

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_txq->axq_q is ath_tx_buf

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: use ath_tx_desc in ar5416ProcTxDesc_20

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
build fix: ath_txq_add_fn_t and ath_tx_comp_fn_t use ath_tx_buf

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>