MAINTAINERS: rectify entry for SY8106A REGULATOR DRIVER

Commit b1c36aae ("regulator: Convert SY8106A binding to a schema")
converts sy8106a-regulator.txt to silergy,sy8106a.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 SY8106A REGULATOR DRIVER.
Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Link: https://lore.kernel.org/r/20211005075451.29691-11-lukas.bulwahn@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

MAINTAINERS

@@ -17780,7 +17780,7 @@ F:	net/switchdev/
 SY8106A REGULATOR DRIVER
 M:	Icenowy Zheng <icenowy@aosc.io>
 S:	Maintained
-F:	Documentation/devicetree/bindings/regulator/sy8106a-regulator.txt
+F:	Documentation/devicetree/bindings/regulator/silergy,sy8106a.yaml
 F:	drivers/regulator/sy8106a-regulator.c
 
 SYNC FILE FRAMEWORK