MAINTAINERS: Add entry for mpq7920 PMIC driver

Add MAINTAINERS entry for Monolithic Power Systems mpq7920 PMIC driver.
Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Link: https://lore.kernel.org/r/20200108131234.24128-5-sravanhome@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

MAINTAINERS

@@ -11138,6 +11138,13 @@ S:	Maintained
 F:	Documentation/driver-api/serial/moxa-smartio.rst
 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:	drivers/regulator/mpq7920.c
+F:	drivers/regulator/mpq7920.h
+
 MR800 AVERMEDIA USB FM RADIO DRIVER
 M:	Alexey Klimov <klimov.linux@gmail.com>
 L:	linux-media@vger.kernel.org