MAINTAINERS: Rectify entry for ROHM MULTIFUNCTION BD9571MWV-M PMIC DEVICE DRIVERS

Commit 983b629 ("dt-bindings: mfd: bd9571mwv: Convert to json-schema")
converts bd9571mwv.txt to rohm,bd9571mwv.yaml, but missed to adjust its
reference in MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains about a
broken reference.

Repair this file reference in ROHM MULTIFUNCTION BD9571MWV-M PMIC DEVICE
DRIVERS.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220308085136.30753-1-lukas.bulwahn@gmail.com

Author: bulwahn

MAINTAINERS

@@ -16674,7 +16674,7 @@ M:	Marek Vasut <marek.vasut+renesas@gmail.com>
 L:	linux-kernel@vger.kernel.org
 L:	linux-renesas-soc@vger.kernel.org
 S:	Supported
-F:	Documentation/devicetree/bindings/mfd/bd9571mwv.txt
+F:	Documentation/devicetree/bindings/mfd/rohm,bd9571mwv.yaml
 F:	drivers/gpio/gpio-bd9571mwv.c
 F:	drivers/mfd/bd9571mwv.c
 F:	drivers/regulator/bd9571mwv-regulator.c