move pinmux.h to drivers/pinmux.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>
Converts the rv32m1 pinmux driver to use 'DT_' prefixed defines instead
of deprecated non-prefixed defines.
Signed-off-by: Maureen Helm <maureen.helm@nxp.com>