MAINTAINERS: update brcm gpio filename pattern

commit 23a71fd616bf ("dt-bindings: brcm: rationalize Broadcom
documentation naming") renamed the file, update the pattern.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Scott Branden <sbranden@broadcom.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

MAINTAINERS

diff --git a/MAINTAINERS b/MAINTAINERS
index bee80cc..c586180 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2329,7 +2329,7 @@
 L:	bcm-kernel-feedback-list@broadcom.com
 S:	Supported
 F:	drivers/gpio/gpio-bcm-kona.c
-F:	Documentation/devicetree/bindings/gpio/gpio-bcm-kona.txt
+F:	Documentation/devicetree/bindings/gpio/brcm,kona-gpio.txt
 
 BROADCOM STB NAND FLASH DRIVER
 M:	Brian Norris <computersforpeace@gmail.com>