rtio: add missing init.h include

File was using init.h API without directly including the header.

(cherry picked from commit fc45b3f)

Original-Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
GitOrigin-RevId: fc45b3f
Change-Id: Iac8b913bd13bd5a4aa617a895d3254e33fe66c21
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/zephyr/+/4822202
Tested-by: ChromeOS Prod (Robot) <chromeos-ci-prod@chromeos-bot.iam.gserviceaccount.com>
Commit-Queue: Yuval Peress <peress@google.com>
Tested-by: Yuval Peress <peress@google.com>
Reviewed-by: Yuval Peress <peress@google.com>

subsys/rtio/rtio_init.c

@@ -3,6 +3,7 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+#include <zephyr/init.h>
 #include <zephyr/rtio/rtio.h>
 #include <zephyr/sys/util.h>
 #include <zephyr/app_memory/app_memdomain.h>