drm/amdgpu: Add an ATPX quirk for hybrid laptop

_PR3 doesn't seem to work properly, use ATPX instead.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=104064


Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org