arm64: dts: renesas: ulcb: Add RPC HyperFlash device node

Add the RPC HyperFlash device node along with its partitions to the
common ULCB board DTS file.

Based on a patch in the BSP by Valentine Barshak.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/61a63e819d4296760ca7ae83ef5226a2c4d7bd93.1648548339.git.geert+renesas@glider.be

arch/arm64/boot/dts/renesas/ulcb.dtsi

@@ -426,6 +426,55 @@ rsnd_for_hdmi: endpoint {
 	};
 };
 
+&rpc {
+	/* Left disabled.  To be enabled by firmware when unlocked. */
+
+	flash@0 {
+		compatible = "cypress,hyperflash", "cfi-flash";
+		reg = <0>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			bootparam@0 {
+				reg = <0x00000000 0x040000>;
+				read-only;
+			};
+			bl2@40000 {
+				reg = <0x00040000 0x140000>;
+				read-only;
+			};
+			cert_header_sa6@180000 {
+				reg = <0x00180000 0x040000>;
+				read-only;
+			};
+			bl31@1c0000 {
+				reg = <0x001c0000 0x040000>;
+				read-only;
+			};
+			tee@200000 {
+				reg = <0x00200000 0x440000>;
+				read-only;
+			};
+			uboot@640000 {
+				reg = <0x00640000 0x100000>;
+				read-only;
+			};
+			dtb@740000 {
+				reg = <0x00740000 0x080000>;
+			};
+			kernel@7c0000 {
+				reg = <0x007c0000 0x1400000>;
+			};
+			user@1bc0000 {
+				reg = <0x01bc0000 0x2440000>;
+			};
+		};
+	};
+};
+
 &rwdt {
 	timeout-sec = <60>;
 	status = "okay";