drm/amd/amdgpu: add pipe1 hardware support

Enable pipe1 support starting from SIENNA CICHLID asic

Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2117


Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Signed-off-by: ZhenGuo Yin <zhenguo.yin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>