arm64: dts: meson: S922X: extend cpu opp-points

Add extra cpu pop points to allow mild overclock on S922X. The opp
points are found in Hardkernel N2 sources [1] and testing shows no
obvious issues on other S922X devices. Thermal throttling should
keep things in-check if needed.

[1] https://github.com/hardkernel/linux/commit/f86cd9487c7483b2a05f448b9ebacf6bd5a2ad2fSigned-off-by: Tim Lewis <elatllat@gmail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Tested-by: Christian Hewitt <christianshewitt@gmail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20200426162119.GA23268@imac

arch/arm64/boot/dts/amlogic/meson-g12b-s922x.dtsi

@@ -65,6 +65,11 @@ opp-1896000000 {
 			opp-hz = /bits/ 64 <1896000000>;
 			opp-microvolt = <981000>;
 		};
+
+		opp-1992000000 {
+			opp-hz = /bits/ 64 <1992000000>;
+			opp-microvolt = <1001000>;
+		};
 	};
 
 	cpub_opp_table_1: opp-table-1 {
@@ -120,5 +125,15 @@ opp-1704000000 {
 			opp-hz = /bits/ 64 <1704000000>;
 			opp-microvolt = <891000>;
 		};
+
+		opp-1800000000 {
+			opp-hz = /bits/ 64 <1800000000>;
+			opp-microvolt = <981000>;
+		};
+
+		opp-1908000000 {
+			opp-hz = /bits/ 64 <1908000000>;
+			opp-microvolt = <1022000>;
+		};
 	};
 };