linux-imx

spi: fsl-espi: remove usage of mpc8xxx_spi->irq

There's no need to access mpc8xxx_spi->irq, we can use function
parameter irq directly.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>