[PATCH v2 1/2] spi: sun6i: Honor CS setup delay on the first transfer with native CS

[Kevin Mehall]

I realized this is incorrect. With a GPIO chip select, sun6i_spi_set_cs() is not called,
thus CS_MANUAL would not be set, and the hardware would then automatically
assert native CS 0 during the transfer. My testing was with native CS 1 and a second GPIO chip select,
so I didn't see this because native CS 0 is not used on the Orange Pi Zero 3.

Therefore, I think the best place to set CS_MANUAL is in sun6i_spi_prepare_message
as I had in my original patch [1], unless you think it should be duplicated in both places
or have a better suggestion of where to set it. sun6i_spi_prepare_message() is still called
before set_cs(), so it still fixes the skipped delay.

[1]: https://lore.kernel.org/linux-spi/20260420164755.1131645-1-km@kevinmehall.net/