MAINTAINERS: Add entry for mp5416 PMIC driver

Add MAINTAINERS entry for Monolithic Power Systems mp5416 PMIC driver.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Link: https://lore.kernel.org/r/20200204110419.25933-4-sravanhome@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

MAINTAINERS

@@ -11259,7 +11259,8 @@ F:	drivers/tty/mxser.*
 MONOLITHIC POWER SYSTEM PMIC DRIVER
 M:	Saravanan Sekar <sravanhome@gmail.com>
 S:	Maintained
-F:	Documentation/devicetree/bindings/regulator/mpq7920.yaml
+F:	Documentation/devicetree/bindings/regulator/mps,mp*.yaml
+F:	drivers/regulator/mp5416.c
 F:	drivers/regulator/mpq7920.c
 F:	drivers/regulator/mpq7920.h