ARM: ux500: Add a DT node for the Nomadik System Timer (MTU0)

The MTU0 is required for full booting of the system. The driver has
been previously DT:ed and is in use on the Nomadik platform, but we
also need to enable it on ux500 based systems.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/ste-dbx5x0.dtsi

@@ -43,6 +43,7 @@ pmu {
 			interrupts = <0 7 IRQ_TYPE_LEVEL_HIGH>;
 		};
 
+
 		clocks {
 			compatible = "stericsson,u8500-clks";
 
@@ -67,6 +68,16 @@ smp_twd_clk: smp-twd-clock {
 			};
 		};
 
+		mtu@a03c6000 {
+			/* Nomadik System Timer */
+			compatible = "st,nomadik-mtu";
+			reg = <0xa03c6000 0x1000>;
+			interrupts = <0 4 IRQ_TYPE_LEVEL_HIGH>;
+
+			clocks = <&prcmu_clk PRCMU_TIMCLK>, <&prcc_pclk 6 6>;
+			clock-names = "timclk", "apb_pclk";
+		};
+
 		timer@a0410600 {
 			compatible = "arm,cortex-a9-twd-timer";
 			reg = <0xa0410600 0x20>;