spirv/cl: add enqueued workgroup size.

Unless the non uniform work group extension is supported, this
just aliases workgroupsize, so just do that for now.

Fixes:
CL CTS basic enqueued_local_size

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7642>

src/compiler/spirv/vtn_variables.c

@@ -915,6 +915,7 @@ vtn_get_builtin_location(struct vtn_builder *b,
       set_mode_system_value(b, mode);
       break;
    case SpvBuiltInWorkgroupSize:
+   case SpvBuiltInEnqueuedWorkgroupSize:
       *location = SYSTEM_VALUE_LOCAL_GROUP_SIZE;
       set_mode_system_value(b, mode);
       break;