brcm63xx: fix HG556a boards and remove fallback board

This changes board info to match the Wiki
http://wiki.openwrt.org/toh/huawei/hg556a, removes the no longer needed
fallback board and fixes HG556 Ralink eeprom extraction.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
[jogo: rename partitions instead]
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

SVN-Revision: 42206

target/linux/brcm63xx/dts/hg556a-a.dts

@@ -23,8 +23,8 @@
 		reg = <0x020000 0xec0000>;
 	};
 
-	caldata@ee0000 {
-		label = "caldata";
+	cal_data@ee0000 {
+		label = "cal_data";
 		reg = <0xee0000 0x100000>;
 		read-only;
 	};

target/linux/brcm63xx/dts/hg556a-b.dts

@@ -23,8 +23,8 @@
 		reg = <0x020000 0xec0000>;
 	};
 
-	caldata@ee0000 {
-		label = "caldata";
+	cal_data@ee0000 {
+		label = "cal_data";
 		reg = <0xee0000 0x100000>;
 		read-only;
 	};

target/linux/brcm63xx/dts/hg556a-c.dts

@@ -23,8 +23,8 @@
 		reg = <0x020000 0xec0000>;
 	};
 
-	caldata@ee0000 {
-		label = "caldata";
+	cal_data@ee0000 {
+		label = "cal_data";
 		reg = <0xee0000 0x100000>;
 		read-only;
 	};