ACPI/PCC: Add maintainer for PCC mailbox driver

Not much functionality is added since PCC driver was added 5 years ago.
There is need to restructure the driver while adding support for PCC
Extended subspaces type 3&4. There is more rework needed as more users
adopt PCC on arm64 platforms. In order to ease the same, I would like
to take responsibility to maintain this driver.

Acked-by: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Sudeep Holla <[email protected]>
Signed-off-by: Jassi Brar <[email protected]>

MAINTAINERS

@@ -401,6 +401,12 @@ L:	[email protected]
 S:	Maintained
 F:	drivers/platform/x86/i2c-multi-instantiate.c
 
+ACPI PCC(Platform Communication Channel) MAILBOX DRIVER
+M:	Sudeep Holla <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	drivers/mailbox/pcc.c
+
 ACPI PMIC DRIVERS
 M:	"Rafael J. Wysocki" <[email protected]>
 M:	Len Brown <[email protected]>