drm/dp: Add DPCD defines for register 0x007
Low four bits are downstream port count. High bit indicates peer OUI support. OUI matching will allow us to do additional per-sink handling for things like DP->VGA bandwidth limits or (hopefully) the iMac-as- display hack. Signed-off-by: NAdam Jackson <ajax@redhat.com> Reviewed-by: NJerome Glisse <jglisse@redhat.com> Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch> Acked-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NDave Airlie <airlied@redhat.com>
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