ARM: shmobile: r8a7791: Fix IPMMU-GP clock to device tree

Signed-off-by: Ryo Kataoka <ryo.kataoka.wt@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -1202,7 +1202,7 @@
 		mstp8_clks: mstp8_clks@e6150990 {
 			compatible = "renesas,r8a7791-mstp-clocks", "renesas,cpg-mstp-clocks";
 			reg = <0 0xe6150990 0 4>, <0 0xe61509a0 0 4>;
-			clocks = <&zg_clk>, <&hp_clk>, <&zg_clk>, <&zg_clk>,
+			clocks = <&zx_clk>, <&hp_clk>, <&zg_clk>, <&zg_clk>,
 			         <&zg_clk>, <&p_clk>, <&zs_clk>, <&zs_clk>;
 			#clock-cells = <1>;
 			clock-indices = <