MAINTAINERS: amd-pstate: Step down as maintainer, add Prateek as reviewer

Mario Limonciello has led amd-pstate maintenance in recent years and
has done excellent work. The amd-pstate driver is in good hands with
him. I am stepping down as co-maintainer as I move on to other things.

Add K Prateek Nayak as a reviewer. He has been actively contributing
to the driver including preferred-core and ITMT improvements, and has
been helping review amd-pstate patches for a while now.

Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Acked-by: K Prateek Nayak <kprateek.nayak@amd.com>
Acked-by: Mario Limonciello (AMD) <superm1@kernel.org>
Link: https://lore.kernel.org/r/20260402102611.16519-1-gautham.shenoy@amd.com
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>

Author: gautshen

MAINTAINERS

@@ -1234,9 +1234,9 @@ F:	drivers/gpu/drm/amd/pm/
 
 AMD PSTATE DRIVER
 M:	Huang Rui <ray.huang@amd.com>
-M:	Gautham R. Shenoy <gautham.shenoy@amd.com>
 M:	Mario Limonciello <mario.limonciello@amd.com>
 R:	Perry Yuan <perry.yuan@amd.com>
+R:	K Prateek Nayak <kprateek.nayak@amd.com>
 L:	linux-pm@vger.kernel.org
 S:	Supported
 F:	Documentation/admin-guide/pm/amd-pstate.rst