drm/amdgpu: Check memory ranges for valid xcp mode

Check the memory ranges available to the device also for deciding a
valid partition mode. Only select combinations are valid for a
particular mode.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Le Ma <le.ma@amd.com>
Reviewed-by: Philip Yang <philip.yang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>