avr32: add RTS/CTS/CLK pin selection for the USARTs

Adds extra parameter to AT32 at32_map_usart(), so as to reserve
RTS/CTS/CLK pins.

All boards under arch/avr32/boards have been updated (trivial change), but
not all have been tested.

Signed-off-by: Peter Ma <pma@mediamatech.com>
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/arch/avr32/boards/atstk1000/atstk1002.c b/arch/avr32/boards/atstk1000/atstk1002.c
index 1f33a10..2adc261 100644
--- a/arch/avr32/boards/atstk1000/atstk1002.c
+++ b/arch/avr32/boards/atstk1000/atstk1002.c
@@ -252,12 +252,12 @@
 void __init setup_board(void)
 {
 #ifdef	CONFIG_BOARD_ATSTK100X_SW2_CUSTOM
-	at32_map_usart(0, 1);	/* USART 0/B: /dev/ttyS1, IRDA */
+	at32_map_usart(0, 1, 0);	/* USART 0/B: /dev/ttyS1, IRDA */
 #else
-	at32_map_usart(1, 0);	/* USART 1/A: /dev/ttyS0, DB9 */
+	at32_map_usart(1, 0, 0);	/* USART 1/A: /dev/ttyS0, DB9 */
 #endif
 	/* USART 2/unused: expansion connector */
-	at32_map_usart(3, 2);	/* USART 3/C: /dev/ttyS2, DB9 */
+	at32_map_usart(3, 2, 0);	/* USART 3/C: /dev/ttyS2, DB9 */
 
 	at32_setup_serial_console(0);
 }