drm/i915: Relocate VBLANK_EVASION_TIME_US

Move the VBLANK_EVASION_TIME_US definition to a slightly
better place.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230418175528.13117-3-ville.syrjala@linux.intel.com


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