drm/amdgpu: add xcc index argument to rlc safe_mode func (v4)

v1: To support multple XCD case (Le)
v2: unify naming style (Le)
v3: apply the changes to gc v11_0 (Hawking)
v4: apply the changes to gc SOC21 (Morris)

Signed-off-by: Le Ma <le.ma@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Morris Zhang <Shiwu.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>