MAINTAINERS: update the list of maintained files for max77650

The DT bindings for MAX77650 MFD have now been converted to YAML.
Update the MAINTAINERS entry for this set of drivers.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Rob Herring <robh@kernel.org>

MAINTAINERS

@@ -9901,8 +9901,8 @@ MAXIM MAX77650 PMIC MFD DRIVER
 M:	Bartosz Golaszewski <bgolaszewski@baylibre.com>
 L:	linux-kernel@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/*/*max77650.txt
-F:	Documentation/devicetree/bindings/*/max77650*.txt
+F:	Documentation/devicetree/bindings/*/*max77650.yaml
+F:	Documentation/devicetree/bindings/*/max77650*.yaml
 F:	include/linux/mfd/max77650.h
 F:	drivers/mfd/max77650.c
 F:	drivers/regulator/max77650-regulator.c