drm/i915/display_wa: Keep enum intel_display_wa sorted

drm/i915/display_wa: Keep enum intel_display_wa sorted

For a consistent way of updating enum intel_display_wa, let's sort it by
lineage number and add a comment asking for future updates to keep it
sorted.

In the same way, let's also keep __intel_display_wa() sorted.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patch.msgid.link/20251222-display-wa-13012396614-timing-of-mdclk-source-selection-v1-1-a2f7e9447f7a@intel.com
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>