drm/i915: Use a 1 second timeout for the polling vblank wait

drm/i915: Use a 1 second timeout for the polling vblank wait

40 msec seems like a very random number for a vblank wait timeout.
Considering ~24Hz display modes are definitely a thing this seems
way too low. Just bump it to a full second to match what we've been
using for normal vblank waits.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260410150449.9699-7-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>