gpio/omap: remove MPUIO handling from _clear_gpio_irqbank()

Remove the OMAP1 #ifdef and MPUIO special case for _clear_gpio_irqbank()

The MPUIOs do not need a register access to ack/clear the IRQ status,
since reading the IRQ status clears it.  In addition, the MPUIO
irq_chip has an empty ack method, so _clear_gpio_irqbank() is never
used for MPUIOs.
Signed-off-by: Kevin Hilman <khilman@ti.com>

drivers/gpio/gpio-omap.c

@@ -657,12 +657,6 @@ static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 	void __iomem *reg = bank->base;
 
 	switch (bank->method) {
-#ifdef CONFIG_ARCH_OMAP1
-	case METHOD_MPUIO:
-		/* MPUIO irqstatus is reset by reading the status register,
-		 * so do nothing here */
-		return;
-#endif
 #ifdef CONFIG_ARCH_OMAP15XX
 	case METHOD_GPIO_1510:
 		reg += OMAP1510_GPIO_INT_STATUS;