spi: mtk-snfi: fix kerneldoc for mtk_snand_is_page_ops()

spi: mtk-snfi: fix kerneldoc for mtk_snand_is_page_ops()

The op argument is missing the colon and is not picked up by the
kerneldoc generator. Fix it to address the following build warning:

drivers/spi/spi-mtk-snfi.c:1201: warning: Function parameter or struct member 'op' not described in 'mtk_snand_is_page_ops'

Fixes: 764f1b748164 ("spi: add driver for MTK SPI NAND Flash Interface")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://patch.msgid.link/20241021142113.71081-1-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>