arm64: dts: rockchip: rk3399: add 528MHz and 600MHz for dmc

Only 200MHz, 300MHz, 400MHz, 528MHz, 600MHz, 666MHz, 732MHz and
800MHz are available at present.

Change-Id: I3a376b389fe6b06b3b32f0c695de2cbde05dfeea
Signed-off-by: Finley Xiao <finley.xiao@rock-chips.com>

Author: finley1226

arch/arm64/boot/dts/rockchip/rk3399-opp.dtsi

@@ -177,8 +177,12 @@
 			opp-hz = /bits/ 64 <400000000>;
 			opp-microvolt = <850000>;
 		};
-		opp-594000000 {
-			opp-hz = /bits/ 64 <594000000>;
+		opp-528000000 {
+			opp-hz = /bits/ 64 <528000000>;
+			opp-microvolt = <900000>;
+		};
+		opp-600000000 {
+			opp-hz = /bits/ 64 <600000000>;
 			opp-microvolt = <900000>;
 		};
 		opp-800000000 {