brcm63xx: add DT support for TD-W8900GB

According to the vendor tarball, the TD-w8900GB's flash has 64k erase
block size, but CFE spans two blocks. So fixup the image offset
accordingly but keep block size at its default (64k).

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jogo: add commit message, add image offset, change nvram offset]
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 43572

target/linux/brcm63xx/dts/td-w8900gb.dts

@@ -0,0 +1,30 @@
+/dts-v1/;
+
+/include/ "bcm6348.dtsi"
+
+/ {
+	model = "TP-Link TD-W8900GB";
+	compatible = "tp-link,td-w8900gb", "brcm,bcm6348";
+};
+
+&pflash {
+	status = "ok";
+
+	linux,part-probe = "bcm63xxpart";
+
+	cfe@0 {
+		label = "CFE";
+		reg = <0x000000 0x020000>;
+		read-only;
+	};
+
+	linux@20000 {
+		label = "linux";
+		reg = <0x020000 0x3d0000>;
+	};
+
+	nvram@3e0000 {
+		label = "nvram";
+		reg = <0x3f0000 0x010000>;
+	};
+};