drm/i915: Make HW readout mark CRTC scaler as in use.
This way we don't accidentally double allocate it. Noticed this when I wrote a patch to sanity check all of the scaler state. Signed-off-by:Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Reviewed-by:
Hans de Goede <hdegoede@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190108160842.13396-4-maarten.lankhorst@linux.intel.com
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