arm64: dts: renesas: r8a77950: Drop operating points above 1.5 GHz

The higher operating frequencies for the Cortex-A57 CPU cores, which
were first documented in the R-Car Gen3 Hardware User's Manual revision
0.54, apply to R-Car H3 ES2.0 (r8a77951).

Play it safe and restrict R-Car H3 ES1.x to 1.5 GHz, by removing the
"turbo-mode" entries from the operating points table inherited from
r8a77951.dtsi.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210311110552.3124180-1-geert+renesas@glider.be

arch/arm64/boot/dts/renesas/r8a77950.dtsi

@@ -29,6 +29,11 @@ &audma1 {
 	       <&ipmmu_mp1 30>, <&ipmmu_mp1 31>;
 };
 
+&cluster0_opp {
+	/delete-node/ opp-1600000000;
+	/delete-node/ opp-1700000000;
+};
+
 &du {
 	renesas,vsps = <&vspd0 0>, <&vspd1 0>, <&vspd2 0>, <&vspd3 0>;
 };