arm64: dts: rockchip: remove cpufreq 1.5G on rk3399-sapphire

Change-Id: I1d8919424fd8047bcf077f6f8cbbb18e5a25d553
Signed-off-by: Zhou weixin <zwx@rock-chips.com>

Author: Zhou weixin

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

@@ -676,10 +676,6 @@
 		opp-hz = /bits/ 64 <1416000000>;
 		opp-microvolt = <1050000>;
 	};
-	opp@1512000000 {
-		opp-hz = /bits/ 64 <1512000000>;
-		opp-microvolt = <1075000>;
-	};
 };
 
 &cluster1_opp {