AVR32: Add clk and gpio infrastructure for macb0 and macb1

Implement functions for configuring the macb0 and macb1 pins, as
well as functions for getting the clock rate of the various
busses the macb ethernet controllers are connected to.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
diff --git a/include/asm-avr32/arch-at32ap7000/gpio.h b/include/asm-avr32/arch-at32ap7000/gpio.h
index adec208..ca966e1 100644
--- a/include/asm-avr32/arch-at32ap7000/gpio.h
+++ b/include/asm-avr32/arch-at32ap7000/gpio.h
@@ -205,6 +205,8 @@
 void gpio_enable_usart1(void);
 void gpio_enable_usart2(void);
 void gpio_enable_usart3(void);
+void gpio_enable_macb0(void);
+void gpio_enable_macb1(void);
 
 #endif /* __ASM_AVR32_ARCH_GPIO_H__ */