MAINTAINERS: Add AMD P-State driver maintainer entry

I will continue to add new feature and processor support, optimize the
performance, and handle the issues for AMD P-State driver.

Signed-off-by: Huang Rui <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: huangrui

MAINTAINERS

@@ -993,6 +993,13 @@ S:	Supported
 T:	git https://gitlab.freedesktop.org/agd5f/linux.git
 F:	drivers/gpu/drm/amd/pm/
 
+AMD PSTATE DRIVER
+M:	Huang Rui <[email protected]>
+L:	[email protected]
+S:	Supported
+F:	Documentation/admin-guide/pm/amd-pstate.rst
+F:	drivers/cpufreq/amd-pstate*
+
 AMD PTDMA DRIVER
 M:	Sanjay R Mehta <[email protected]>
 L:	[email protected]