include: add missing kernel.h include
Some files make use of Kernel APIs without including kernel.h, fix this
problem.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
diff --git a/subsys/fs/fs.c b/subsys/fs/fs.c
index 91aedc1..edd3922 100644
--- a/subsys/fs/fs.c
+++ b/subsys/fs/fs.c
@@ -11,6 +11,7 @@
#include <zephyr/types.h>
#include <errno.h>
#include <zephyr/init.h>
+#include <zephyr/kernel.h>
#include <zephyr/fs/fs.h>
#include <zephyr/fs/fs_sys.h>
#include <zephyr/sys/check.h>