include: sys: util: Move macros from util to util_macro

The <sys/util.h>, in current form, can not be used with DTS as it
contains non-C pre-processor definitions which breake DTS interpreter.
This commit fixes the problem by moving most of preprocessor macros
from util.h to util_macro.h.  Since util_mcaro.h contains only
preprocessor macros, without include dependencies, it can be safely
included in DTS. It is similar way the
<dts/arm/<manufacturer>/pinctrl_<manufacturer>_<soc>.h files are
included.

This fix and align the extern "C" closing brack inside non assembly
block.

The issue was raised when try create a macro for pincrtl with a
variable length flag list.

Signed-off-by: Gerson Fernando Budke <nandojve@gmail.com>