brcm47xx: revert r33935: check for .ELF header in partition parser

For sysupgrade the generic image should be used and the special image for the wgt634u is just needed for initial flashing over CFE.
russell reported that with this patch sysupgrdae did not worked for him any more and he could not reproduce the error described in #11420.
With the patch the linux partition also contained the loader which is in the first 128KB.

SVN-Revision: 34201

target/linux/brcm47xx/patches-3.3/050-mtd-add-bcm47xx-part-parser.patch

@@ -26,7 +26,7 @@
  obj-$(CONFIG_MTD_CHAR)		+= mtdchar.o
 --- /dev/null
 +++ b/drivers/mtd/bcm47xxpart.c
-@@ -0,0 +1,548 @@
+@@ -0,0 +1,542 @@
 +/*
 + *  Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
 + *  Copyright (C) 2005 Waldemar Brodkorb <wbx@openwrt.org>
@@ -96,11 +96,6 @@
 +	u32 offsets[TRX_MAX_OFFSET];	/* Offsets of partitions from start of header */
 +};
 +
-+/* for WGT634U search the ELF-header of
-+ * the kernel decompressor instead of TRX
-+ */
-+#define WGT634U_ELF_MAGIC	0x464c457f /*  ".ELF"  */
-+
 +/* for Edimax Print servers which use an additional header
 + * then the firmware on flash looks like :
 + * EDIMAX HEADER | TRX HEADER
@@ -154,8 +149,7 @@
 +		}
 +
 +		/* found a TRX header */
-+		if (le32_to_cpu(trx->magic) == TRX_MAGIC ||
-+		    le32_to_cpu(trx->magic) == WGT634U_ELF_MAGIC)
++		if (le32_to_cpu(trx->magic) == TRX_MAGIC)
 +			goto found;
 +	}
 +