Convert driver to use new DT_INST macros throughout. This allows us to
also remove dts_fixup.h that are no longer used.
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
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>