ata: libata-sff: replace kmap_atomic() with kmap_local_page()

kmap_atomic() is deprecated in favour of kmap_local_page(), as described
in Documentation/mm/highmem.rst.

ata_pio_xfer() and __atapi_pio_bytes() each map a single page, pass the
address to ->sff_data_xfer() for one transfer and unmap it again, so the
mapping never leaves the function that created it.

Neither needs the pagefault_disable() and preempt_disable() implied by
kmap_atomic(). ->sff_data_xfer() only moves data between the device and
the mapped buffer, and both functions are reached only through
ata_sff_hsm_move() with the host lock held, whether from the PIO task,
an interrupt handler or EH. kmap_local_page() is fine in all of these.

Assisted-by: LLM sparse
Signed-off-by: Danish Khateeb <danishkhateeb03@gmail.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20260921182448.194307-1-danishkhateeb03@gmail.com
Signed-off-by: Niklas Cassel <cassel@kernel.org>

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