drm/i915: Don't set up HDMI ports that aren't in the BIOS device table.
Use the child device array to decide whether the given HDMI output should be initialized. If the given HDMI port can't be found in child device array, it is not present and won't be initialized. Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Signed-off-by: Eric Anholt <eric@anholt.net>
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