drm/amd/display: Use macro for invalid OPP ID
[WHY] This is meant to make it clearer that 0xf is not a valid OPP ID, and that code making use of OPP IDs should not accept this value. Signed-off-by: NWesley Chalmers <Wesley.Chalmers@amd.com> Reviewed-by: NCharlene Liu <Charlene.Liu@amd.com> Acked-by: NBhawanpreet Lakha <Bhawanpreet.Lakha@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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