include: zephyr: sys: Introduce IS_BIT_SET() macro

This macro is defined in a few places which leads to macro redefinition
error e.g. when compiling prometheus network sample for NPCX boards.

Provide one definition of IS_BIT_SET() in util_macro.h to fix the
problem.

Signed-off-by: Patryk Duda <patrykd@google.com>