MAINTAINERS: fix a renamed DT reference

Fix this rename:

	Documentation/devicetree/bindings/i2c/{i2c-mv64xxx.txt -> marvell,mv64xxx-i2c.yaml}

Fixes: f8bbde72 ("dt-bindings: i2c: mv64xxx: Add YAML schemas")
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

MAINTAINERS

@@ -7517,7 +7517,7 @@ I2C MV64XXX MARVELL AND ALLWINNER DRIVER
 M:	Gregory CLEMENT <gregory.clement@bootlin.com>
 L:	linux-i2c@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
+F:	Documentation/devicetree/bindings/i2c/marvell,mv64xxx-i2c.yaml
 F:	drivers/i2c/busses/i2c-mv64xxx.c
 
 I2C OVER PARALLEL PORT