arm64: dt: OP-TEE for Juno **not for mainline**

Configures Juno with OP-TEE.
Reviewed-by: NPascal Brand <pascal.brand@linaro.org>
Signed-off-by: NJens Wiklander <jens.wiklander@linaro.org>
[jf: rebase onto v5.9-rc7]
Signed-off-by: NJerome Forissier <jerome@forissier.org>

arch/arm64/boot/dts/arm/juno-base.dtsi

@@ -803,6 +803,17 @@ memory@80000000 {
 		      <0x00000008 0x80000000 0x1 0x80000000>;
 	};
 
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		/* Shared memory between secure and non-secure world */
+		optee@0xfee00000 {
+			reg = <0x00000000 0xfee00000 0 0x00200000>;
+		};
+	};
+
 	bus@8000000 {
 		compatible = "simple-bus";
 		#address-cells = <2>;
@@ -840,4 +851,11 @@ site2: tlx-bus@60000000 {
 		interrupt-map-mask = <0 0>;
 		interrupt-map = <0 0 &gic 0 GIC_SPI 168 IRQ_TYPE_LEVEL_HIGH>;
 	};
+
+	firmware {
+		optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+		};
+	};
 };