drm/amdgpu: Drop PMFW RLC notifier from amdgpu_device_suspend()

drm/amdgpu: Drop PMFW RLC notifier from amdgpu_device_suspend()

For S3 on vangogh, PMFW needs to be notified before the
driver powers down RLC.  This already happens in smu_disable_dpms()
so drop the superfluous call in amdgpu_device_suspend().

Co-developed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello (AMD) <superm1@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 960e30a61e1a7ca5341a6cf9481e770e1cda24aa)