spi: mxic: Add support for swapping byte

Some SPI-NOR flash swap the bytes on a 16-bit boundary when
configured in Octal DTR mode. It means data format D0 D1 D2 D3
would be swapped to D1 D0 D3 D2. So that whether controller
support swapping bytes should be checked before enable Octal
DTR mode. Add swap byte support on a 16-bit boundary when
configured in Octal DTR mode for Macronix xSPI host controller
driver.

According dtr_swab in operation to enable/disable Macronix
xSPI host controller swap byte feature.

To make sure swap byte feature is working well, program data in
1S-1S-1S mode then read back and compare read data in 8D-8D-8D
mode.

This feature have been validated on byte-swap flash and
non-byte-swap flash.

Macronix xSPI host controller bit "HC_CFG_DATA_PASS" determine
the byte swap feature disabled/enabled and swap byte feature is
working on 8D-8D-8D mode only.

Suggested-by: Michael Walle <mwalle@kernel.org>
Signed-off-by: JaimeLiao <jaimeliao@mxic.com.tw>
Signed-off-by: AlvinZhou <alvinzhou@mxic.com.tw>
Acked-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240926141956.2386374-6-alvinzhou.tw@gmail.com


Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>