ata: libata: Improve return value of atapi_check_dma()

atapi_check_dma() allows a LLD to filter ATAPI commands, returning a
status indicating whether or not it is OK to use DMA for the supplied
ATAPI command.

Change atapi_check_dma() to return -EOPNOTSUPP instead of 1 for an
ATAPI command that is not allowed to use DMA.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Link: https://lore.kernel.org/r/20250312133954.6666-1-chenhuacai@loongson.cn


[cassel: improve commit log]
Signed-off-by: Niklas Cassel <cassel@kernel.org>