ARM: shmobile: r8a7791: Add thermal clock in device tree

Add the missing thermal MSTP clock to the thermal device node.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -151,6 +151,7 @@ thermal@e61f0000 {
 		reg = <0 0xe61f0000 0 0x14>, <0 0xe61f0100 0 0x38>;
 		interrupt-parent = <&gic>;
 		interrupts = <0 69 IRQ_TYPE_LEVEL_HIGH>;
+		clocks = <&mstp5_clks R8A7791_CLK_THERMAL>;
 	};
 
 	timer {