drm/i915: drop i915 param from i915_fence{, _context}_timeout()

drm/i915: drop i915 param from i915_fence{, _context}_timeout()

The i915_fence_context_timeout() and i915_fence_timeout() functions both
have the struct drm_i915_private parameter, which is unused. It's likely
in preparation for something that just didn't end up happening.

Remove them, dropping the last struct drm_i915_private usage for xe
display build.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/dce86cb031d523a95a96ed2bf9c93bb28e6b20ab.1767009044.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>