ARM: BCM5301X: Add DT entry for SPI controller and NOR flash

Controller is present on every BCM4708* board but only few devices have
serial flash attached so mark it as disabled by default.
Signed-off-by: NRafał Miłecki <zajec5@gmail.com>
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm4708-luxul-xwc-1000.dts

@@ -59,3 +59,7 @@
 &uart0 {
 	status = "okay";
 };
+
+&spi_nor {
+	status = "okay";
+};

arch/arm/boot/dts/bcm4708-smartrg-sr400ac.dts

@@ -122,3 +122,7 @@
 &uart0 {
 	status = "okay";
 };
+
+&spi_nor {
+	status = "okay";
+};

arch/arm/boot/dts/bcm5301x.dtsi

@@ -225,6 +225,20 @@
 			#address-cells = <1>;
 			#size-cells = <1>;
 		};
+
+		spi@29000 {
+			reg = <0x00029000 0x1000>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			spi_nor: spi-nor@0 {
+				compatible = "jedec,spi-nor";
+				reg = <0>;
+				spi-max-frequency = <20000000>;
+				linux,part-probe = "ofpart", "bcm47xxpart";
+				status = "disabled";
+			};
+		};
 	};
 
 	lcpll0: lcpll0@1800c100 {