spi: fsl-(e)spi: simplify cleanup code

Now that most cleanup is done automatically the remove functions
can be significantly simplified.

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

drivers/spi/spi-fsl-lib.h

@@ -54,9 +54,6 @@ struct mpc8xxx_spi {
 	void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
 	u32(*get_tx) (struct mpc8xxx_spi *);
 
-	/* hooks for different controller driver */
-	void (*spi_remove) (struct mpc8xxx_spi *mspi);
-
 	unsigned int count;
 	unsigned int irq;