ARM: dts: BCM5301X: convert to iProc QSPI

The iproc-qspi driver is the SPI driver that should be used going
forward.  Modify the SPI DT entry to use this driver, and add an entry
in the bcm953012k DTS file to enable the SPI.

Tested on the bcm953012k board.

Signed-off-by: Jon Mason <jon.mason@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm953012k.dts

@@ -84,6 +84,32 @@
 	};
 };
 
+&spi_nor {
+	status = "okay";
+	spi-max-frequency = <62500000>;
+	m25p,default-addr-width = <3>;
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	partition@0 {
+		label = "boot";
+		reg = <0x00000000 0x000d0000>;
+	};
+	partition@d000 {
+		label = "env";
+		reg = <0x000d0000 0x00030000>;
+	};
+	partition@100000 {
+		label = "system";
+		reg = <0x00100000 0x00600000>;
+	};
+	partition@700000 {
+		label = "rootfs";
+		reg = <0x00700000 0x00900000>;
+	};
+};
+
 &uart0 {
 	clock-frequency = <62499840>;
 };