drm/i915: Fix workarounds on Gen2-3

In 36537275 ("drm/i915: Simplify internal helper function signature")
I broke the old platforms by not noticing engine workaround init does not
initialize the list on old platforms. Fix it by always initializing which
already does the right thing by mostly not doing anything if there aren't
any workarounds on the list.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Fixes: 36537275 ("drm/i915: Simplify internal helper function signature")
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221118115249.2683946-1-tvrtko.ursulin@linux.intel.com
(cherry picked from commit 71feb6f9)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/i915/gt/intel_workarounds.c

@@ -3011,7 +3011,7 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 static void
 engine_init_workarounds(struct intel_engine_cs *engine, struct i915_wa_list *wal)
 {
-	if (I915_SELFTEST_ONLY(GRAPHICS_VER(engine->i915) < 4))
+	if (GRAPHICS_VER(engine->i915) < 4)
 		return;
 
 	engine_fake_wa_init(engine, wal);
@@ -3036,9 +3036,6 @@ void intel_engine_init_workarounds(struct intel_engine_cs *engine)
 {
 	struct i915_wa_list *wal = &engine->wa_list;
 
-	if (GRAPHICS_VER(engine->i915) < 4)
-		return;
-
 	wa_init_start(wal, engine->gt, "engine", engine->name);
 	engine_init_workarounds(engine, wal);
 	wa_init_finish(wal);