ARM: dts: at91: sama5d4 Xplained: use TCB2 as timers

As TCB2 doesn't have any output pins, use for timers.
Tested-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/at91-sama5d4_xplained.dts

@@ -130,6 +130,18 @@ spi1: spi@fc018000 {
 				status = "okay";
 			};
 
+			tcb2: timer@fc024000 {
+				timer0: timer@0 {
+					compatible = "atmel,tcb-timer";
+					reg = <0>;
+				};
+
+				timer1: timer@1 {
+					compatible = "atmel,tcb-timer";
+					reg = <1>;
+				};
+			};
+
 			adc0: adc@fc034000 {
 				pinctrl-names = "default";
 				pinctrl-0 = <