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

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>