MAINTAINERS: update ARM/BCMRING MTD NAND DRIVER file patterns

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Leo Chen <leochen@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -574,7 +574,6 @@ L:	linux-mtd@lists.infradead.org
 S:	Maintained
 F:	drivers/mtd/nand/bcm_umi_nand.c
 F:	drivers/mtd/nand/bcm_umi_bch.c
-F:	drivers/mtd/nand/bcm_umi_hamming.c
 F:	drivers/mtd/nand/nand_bcm_umi.h
 
 ARM/CAVIUM NETWORKS CNS3XXX MACHINE SUPPORT