ARM: dts: r7s72100: fix ethernet clock parent

Technically, the Ethernet block is run off the 133MHz Bus (B) clock, not
the 33MHz Peripheral 0 (P0) clock.

Fixes: 969244f9c720 ("ARM: dts: r7s72100: add ethernet clock to device tree")
Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r7s72100.dtsi

@@ -121,7 +121,7 @@
 			#clock-cells = <1>;
 			compatible = "renesas,r7s72100-mstp-clocks", "renesas,cpg-mstp-clocks";
 			reg = <0xfcfe0430 4>;
-			clocks = <&p0_clk>;
+			clocks = <&b_clk>;
 			clock-indices = <R7S72100_CLK_ETHER>;
 			clock-output-names = "ether";
 		};