cleanup: include/: move misc/math_extras.h to sys/math_extras.h move misc/math_extras.h to sys/math_extras.h and create a shim for backward-compatibility. No functional changes to the headers. A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES. Related to #16539 Signed-off-by: Anas Nashif <anas.nashif@intel.com>

diff --git a/kernel/include/syscall_handler.h b/kernel/include/syscall_handler.h
index ab2449d..13fb352 100644
--- a/kernel/include/syscall_handler.h
+++ b/kernel/include/syscall_handler.h

@@ -13,7 +13,7 @@
 #ifndef _ASMLANGUAGE
 #include <kernel.h>
 #include <misc/printk.h>
-#include <misc/math_extras.h>
+#include <sys/math_extras.h>
 #include <kernel_internal.h>
 #include <stdbool.h>
 

diff --git a/kernel/mempool.c b/kernel/mempool.c
index ad2849f..35c42dd 100644
--- a/kernel/mempool.c
+++ b/kernel/mempool.c

@@ -10,7 +10,7 @@
 #include <init.h>
 #include <string.h>
 #include <sys/__assert.h>
-#include <misc/math_extras.h>
+#include <sys/math_extras.h>
 #include <stdbool.h>
 
 static struct k_spinlock lock;

diff --git a/kernel/msg_q.c b/kernel/msg_q.c
index ef0bf43..2ae117a 100644
--- a/kernel/msg_q.c
+++ b/kernel/msg_q.c

@@ -18,7 +18,7 @@
 #include <string.h>
 #include <wait_q.h>
 #include <sys/dlist.h>
-#include <misc/math_extras.h>
+#include <sys/math_extras.h>
 #include <init.h>
 #include <syscall_handler.h>
 #include <kernel_internal.h>

diff --git a/kernel/thread.c b/kernel/thread.c
index 90d0ade..a360511 100644
--- a/kernel/thread.c
+++ b/kernel/thread.c

@@ -19,7 +19,7 @@
 #include <spinlock.h>
 #include <kernel_structs.h>
 #include <misc/printk.h>
-#include <misc/math_extras.h>
+#include <sys/math_extras.h>
 #include <sys_clock.h>
 #include <drivers/timer/system_timer.h>
 #include <ksched.h>

diff --git a/kernel/userspace.c b/kernel/userspace.c
index 819db64..49f8d7c 100644
--- a/kernel/userspace.c
+++ b/kernel/userspace.c

@@ -7,7 +7,7 @@
 
 #include <kernel.h>
 #include <string.h>
-#include <misc/math_extras.h>
+#include <sys/math_extras.h>
 #include <misc/printk.h>
 #include <misc/rb.h>
 #include <kernel_structs.h>