MAINTAINERS: repair file entry in AIROHA SPI SNFI DRIVER

MAINTAINERS: repair file entry in AIROHA SPI SNFI DRIVER

Commit a403997c1201 ("spi: airoha: add SPI-NAND Flash controller driver")
adds a new section AIROHA SPI SNFI DRIVER referring to the file
spi-airoha.c. The commit however adds the file spi-airoha-snfi.c.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair this file entry in the AIROHA SPI SNFI DRIVER section.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@redhat.com>
Link: https://lore.kernel.org/r/20240507141449.177538-1-lukas.bulwahn@redhat.com
Signed-off-by: Mark Brown <broonie@kernel.org>