kernel: drop Fon(Foxconn) parser matching for the "firmware" partition

This parser's matching function appears to be too generic as it matches
e.g. Buffalo WZR-HP-G300NH. That results in incorrect parts parsing.

Luckily this parser is needed by Fon FON2601 only which uses DT-based
ramips target. It means we can depend on mtd subsystem matching of
"fonfxc,uimage" string.

That said triggering this parser based on the "firmware" (or whatever
MTD_SPLIT_FIRMWARE_NAME is) partiiton name is not needed. It can be
dropped which will automatically fix the Buffalo WZR-HP-G300NH case.

Fixes: a1c6a316d2 ("ramips: add support for Fon FON2601")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_uimage.c

@@ -421,7 +421,6 @@ static struct mtd_part_parser uimage_fonfxc_parser = {
 	.of_match_table = mtdsplit_uimage_fonfxc_of_match_table,
 #endif
 	.parse_fn = mtdsplit_uimage_parse_fonfxc,
-	.type = MTD_PARSER_TYPE_FIRMWARE,
 };
 
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