spi: uniphier: Change argument of irq functions to private structure

This changes each argument of functions uniphier_irq_{enable,disable}()
to uniphier_spi_priv because these functions are used not only for
spi_device but also for the entire controller.

Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Link: https://lore.kernel.org/r/1577149107-30670-3-git-send-email-hayashi.kunihiko@socionext.com


Signed-off-by: Mark Brown <broonie@kernel.org>