drm/i915/bios: Fix VBT ACPI DPMS bit polarity

We have the ACPI vs. not ACPI DPMS bit polarity the
wrong way around. Fix it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907093534.29004-1-ville.syrjala@linux.intel.com


Reviewed-by: Jani Nikula <jani.nikula@intel.com>