ARM: dts: dra7: Enable 1.5 GHz operation for the CPU

After ti-opp-supply driver is in place to provide AVS Class0 and abb
regulator scaling support let's enable 1.5GHz for the cpu.
Signed-off-by: NDave Gerlach <d-gerlach@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/dra7.dtsi

@@ -116,6 +116,13 @@
 
 			opp-supported-hw = <0xFF 0x02>;
 		};
+
+		opp_high@1500000000 {
+			opp-hz = /bits/ 64 <1500000000>;
+			opp-microvolt = <1210000 950000 1250000>,
+					<1210000 950000 1250000>;
+			opp-supported-hw = <0xFF 0x04>;
+		};
 	};
 
 	/*