Split the 'video' ACPI lock up into two locks to resolve a LOR with the sysctl lock.  The 'video' lock now protects the 'bus' of video output devices attached to a graphics adapter.  It is used when iterating over the list of outputs, etc.  The 'video_output' lock is used to lock the output-specific data similar to a driver lock for the individual video outputs.
Split the 'video' ACPI lock up into two locks to resolve a LOR with the
sysctl lock.  The 'video' lock now protects the 'bus' of video output
devices attached to a graphics adapter.  It is used when iterating over
the list of outputs, etc.  The 'video_output' lock is used to lock the
output-specific data similar to a driver lock for the individual video
outputs.

MFC after:	2 weeks

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