[AVR32] gpio_*_cansleep() fix

The AVR32 <asm/gpio.h> was missing the gpio_*_cansleep() calls,
breaking compilation for some code using them.

Signed-off-by: David Brownell <[e-mail]>
Signed-off-by: Haavard Skinnemoen <[e-mail]>

include/asm-avr32/arch-at32ap/gpio.h

···
 int gpio_get_value(unsigned int gpio);
 void gpio_set_value(unsigned int gpio, int value);
 
+#include <asm-generic/gpio.h>		/* cansleep wrappers */
+
 static inline int gpio_to_irq(unsigned int gpio)
 {
 	return gpio + GPIO_IRQ_BASE;