arm64: dt: OP-TEE for FVP Base RevC

Configures FVP Base RevC with OP-TEE.

With commit 1bf41f5d9b0d ("fvp: add Trusted Services support") in
https://github.com/OP-TEE/build there is support for building running
with the FVP Base RevC model. However, some updates to the DTB passed
to the kernel is missing for the OP-TEE driver to be probed. So fix that
by adding an OP-TEE node in the DTS.

Signed-off-by: Jens Wiklander <[email protected]>

arch/arm64/boot/dts/arm/fvp-base-revc.dts

@@ -110,6 +110,11 @@
 			reg = <0x00000000 0x18000000 0 0x00800000>;
 			no-map;
 		};
+
+		optee@83000000 {
+			reg = <0x00000000 0x83000000 0 0x01000000>;
+			no-map;
+		};
 	};
 
 	gic: interrupt-controller@2f000000 {
@@ -243,4 +248,11 @@
 				<0 0 43 &gic 0 0 GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>,
 				<0 0 44 &gic 0 0 GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
 	};
+
+	firmware {
+		optee {
+			compatible = "linaro,optee-tz";
+			method = "smc";
+		};
+	};
 };