MAINTAINERS: update ti,omap-gpio.yaml reference

Changeset bc3aca53 ("dt-bindings: gpio: omap: Convert to json-schema")
renamed: Documentation/devicetree/bindings/gpio/gpio-omap.txt
to: Documentation/devicetree/bindings/gpio/ti,omap-gpio.yaml.

Update its cross-reference accordingly.

Fixes: bc3aca53 ("dt-bindings: gpio: omap: Convert to json-schema")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

MAINTAINERS

@@ -13325,7 +13325,7 @@ M:	Santosh Shilimkar <ssantosh@kernel.org>
 M:	Kevin Hilman <khilman@kernel.org>
 L:	linux-omap@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/gpio/gpio-omap.txt
+F:	Documentation/devicetree/bindings/gpio/ti,omap-gpio.yaml
 F:	drivers/gpio/gpio-omap.c
 
 OMAP HARDWARE SPINLOCK SUPPORT