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 <[email protected]>
Acked-by: Scott Branden <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6de3307..44c63e5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2339,7 +2339,7 @@
 L:	[email protected]
 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 NVRAM DRIVER
 M:	Rafał Miłecki <[email protected]>