MAINTAINERS: Add entry for Intel PMC mux driver

I will be maintaining the Intel PMC mux control driver.
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20200507150900.12102-5-heikki.krogerus@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

MAINTAINERS

@@ -17580,6 +17580,13 @@ F:	Documentation/driver-api/usb/typec.rst
 F:	drivers/usb/typec/
 F:	include/linux/usb/typec.h
 
+USB TYPEC INTEL PMC MUX DRIVER
+M:	Heikki Krogerus <heikki.krogerus@linux.intel.com>
+L:	linux-usb@vger.kernel.org
+S:	Maintained
+F:	Documentation/firmware-guide/acpi/intel-pmc-mux.rst
+F:	drivers/usb/typec/mux/intel_pmc_mux.c
+
 USB TYPEC PI3USB30532 MUX DRIVER
 M:	Hans de Goede <hdegoede@redhat.com>
 L:	linux-usb@vger.kernel.org