drm/amd/display: use new pipe allocation interface in dcn32 fpu

This commit implements a new pipe resource allocation logic for DCN32
when windowed ODM MPO flag is set to enable testing. By default the
flag is not set. It will be toggled on after we complete testing.
Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Wenjing Liu <wenjing.liu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>