drm/amd/psp: Fix sysfs: cannot create duplicate filename

drm/amd/psp: Fix sysfs: cannot create duplicate filename

commit f1bcddffe46b349a82445a8d9efd5f5fcb72557f upstream.

psp sysfs not cleaned up on driver unload for sienna_cichlid

Fixes: ce87c98db428e7 ("drm/amdgpu: Include sienna_cichlid in USBC PD FW support.")
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org # 5.9.x
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>