ARM: at91: fix usart/uart namimg in pinctrl

USART are the full pin uart
DBGU the debug Unit
UART the two pin uart

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
index e33ab0a..04f048f 100644
--- a/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
+++ b/arch/arm/boot/dts/at91sam9g20ek_common.dtsi
@@ -36,11 +36,11 @@
 
 			usart0: serial@fffb0000 {
 				pinctrl-0 =
-					<&pinctrl_uart0
-					 &pinctrl_uart0_rts_cts
-					 &pinctrl_uart0_dtr_dsr
-					 &pinctrl_uart0_dcd
-					 &pinctrl_uart0_ri>;
+					<&pinctrl_usart0
+					 &pinctrl_usart0_rts_cts
+					 &pinctrl_usart0_dtr_dsr
+					 &pinctrl_usart0_dcd
+					 &pinctrl_usart0_ri>;
 				status = "okay";
 			};