ACPI fixes for v4.10-rc6

 - Revert a recent change that added an ACPI video blacklist entry
   for HP Pavilion dv6 as it turned to introduce backlight handling
   regressions on some systems (Hans de Goede).

 - Fix locking in the ACPICA core to avoid deadlocks related to table
   loading that were exposed by a recent change in that area (Lv Zheng).
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