drm/i915: Noop lrc_init_wa_ctx() on recent/future platforms

Except for graphics version 8 and 9, nothing is done in
lrc_init_wa_ctx(). Assume this won't be needed on future platforms as
well and remove the warning.

Note that this function is not called for anything below version 8 since
those don't use either guc or execlist, i.e. HAS_EXECLISTS() is false.
Reviewed-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220907230841.1703574-1-lucas.demarchi@intel.com

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

@@ -1718,24 +1718,16 @@ void lrc_init_wa_ctx(struct intel_engine_cs *engine)
 	unsigned int i;
 	int err;
 
-	if (!(engine->flags & I915_ENGINE_HAS_RCS_REG_STATE))
+	if (GRAPHICS_VER(engine->i915) >= 11 ||
+	    !(engine->flags & I915_ENGINE_HAS_RCS_REG_STATE))
 		return;
 
-	switch (GRAPHICS_VER(engine->i915)) {
-	case 12:
-	case 11:
-		return;
-	case 9:
+	if (GRAPHICS_VER(engine->i915) == 9) {
 		wa_bb_fn[0] = gen9_init_indirectctx_bb;
 		wa_bb_fn[1] = NULL;
-		break;
-	case 8:
+	} else if (GRAPHICS_VER(engine->i915) == 8) {
 		wa_bb_fn[0] = gen8_init_indirectctx_bb;
 		wa_bb_fn[1] = NULL;
-		break;
-	default:
-		MISSING_CASE(GRAPHICS_VER(engine->i915));
-		return;
 	}
 
 	err = lrc_create_wa_ctx(engine);