cleanup: include/: move misc/mutex.h to sys/mutex.h

move misc/mutex.h to sys/mutex.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>
10 files changed