ARM: dts: at91: at91sam9g20ek: use TCB0 as timers

Use tcb0 for timers as selected in at91_dt_defconfig.
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91sam9g20ek_common.dtsi

@@ -51,6 +51,18 @@ dbgu: serial@fffff200 {
 				status = "okay";
 			};
 
+			tcb0: timer@fffa0000 {
+				timer@0 {
+					compatible = "atmel,tcb-timer";
+					reg = <0>, <1>;
+				};
+
+				timer@2 {
+					compatible = "atmel,tcb-timer";
+					reg = <2>;
+				};
+			};
+
 			usart0: serial@fffb0000 {
 				pinctrl-0 =
 					<&pinctrl_usart0