ARM: shmobile: r8a7791 dtsi: Remove bogus imp_clk node

R-Car M2-W does not have an IMP core or an IMP clock.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/boot/dts/r8a7791.dtsi

@@ -1163,14 +1163,6 @@ m2_clk: m2_clk {
 			clock-mult = <1>;
 			clock-output-names = "m2";
 		};
-		imp_clk: imp_clk {
-			compatible = "fixed-factor-clock";
-			clocks = <&cpg_clocks R8A7791_CLK_PLL1>;
-			#clock-cells = <0>;
-			clock-div = <4>;
-			clock-mult = <1>;
-			clock-output-names = "imp";
-		};
 		rclk_clk: rclk_clk {
 			compatible = "fixed-factor-clock";
 			clocks = <&cpg_clocks R8A7791_CLK_PLL1>;