MAINTAINERS: serial:blackfin: update F: pattern

commit 0c6967b5 ("serial:blackfin: rename Blackfin serial driver to
bfin_uart.c") renamed the file, update the pattern.
Signed-off-by: NJoe Perches <joe@perches.com>
Acked-by: NSonic Zhang <sonic.zhang@analog.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -1487,7 +1487,7 @@ M:	Sonic Zhang <sonic.zhang@analog.com>
 L:	uclinux-dist-devel@blackfin.uclinux.org
 W:	http://blackfin.uclinux.org
 S:	Supported
-F:	drivers/tty/serial/bfin_5xx.c
+F:	drivers/tty/serial/bfin_uart.c
 
 BLACKFIN WATCHDOG DRIVER
 M:	Mike Frysinger <vapier.adi@gmail.com>