drm/amdgpu: Use mode2 mode to perform GPU RESET for Renoir

Renoir need to use mode2 mode to implement GPU RESET

Signed-off-by: chen gong <curry.gong@amd.com>
Reviewed-by: Aaron Liu <aaron.liu@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>