Here, we can not use IS_ENABLED() because of the "||" operator in
its define. It is true config_enabled() works well, but it is a bit
ambiguous to be used against config options.
This commit makes IS_ENABLED() available in more generic context by
calculating "or" with macro expansion only.
Do likewise for IS_REACHABLE().
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Michal Marek <mmarek@suse.com>