ARM: dts: r8a7794: fix PWM clock parent

When removing the non-existing thermal clock I forgot to remove its
parent from the node's "clocks" property  -- this led to a wrong PWM
clock's parent clock.

Fixes: 2a29f9d6 ("ARM: dts: r8a7794: add MSTP5 clocks")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7794.dtsi

@@ -1251,7 +1251,7 @@ mstp4_clks: mstp4_clks@e6150140 {
 		mstp5_clks: mstp5_clks@e6150144 {
 			compatible = "renesas,r8a7794-mstp-clocks", "renesas,cpg-mstp-clocks";
 			reg = <0 0xe6150144 0 4>, <0 0xe615003c 0 4>;
-			clocks = <&hp_clk>, <&extal_clk>, <&p_clk>;
+			clocks = <&hp_clk>, <&p_clk>;
 			#clock-cells = <1>;
 			clock-indices = <R8A7794_CLK_AUDIO_DMAC0
 					 R8A7794_CLK_PWM>;