wifi: rtw88: Move enum rtw_tx_queue_type mapping code to tx.{c,h}

This code is not specific to the PCIe bus type but can be re-used by USB
and SDIO bus types. Move it to tx.{c,h} to avoid code-duplication in the
future. While here, add checking of the ac argument in
rtw_tx_ac_to_hwq() so we're not accessing entries beyond the end of the
array.

Signed-off-by: Martin Blumenstingl <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Reviewed-by: Ping-Ke Shih <[email protected]>
Signed-off-by: Kalle Valo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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