kernel: migrate includes to <zephyr/...>

In order to bring consistency in-tree, migrate all kernel code to the
new prefix <zephyr/...>. Note that the conversion has been scripted,
refer to zephyrproject-rtos#45388 for more details.

Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/kernel/include/kernel_offsets.h b/kernel/include/kernel_offsets.h
index df83112..0a665b5 100644
--- a/kernel/include/kernel_offsets.h
+++ b/kernel/include/kernel_offsets.h
@@ -3,9 +3,9 @@
  *
  * SPDX-License-Identifier: Apache-2.0
  */
-#include <device.h>
+#include <zephyr/device.h>
 
-#include <pm/device.h>
+#include <zephyr/pm/device.h>
 
 #ifndef ZEPHYR_KERNEL_INCLUDE_KERNEL_OFFSETS_H_
 #define ZEPHYR_KERNEL_INCLUDE_KERNEL_OFFSETS_H_