Currently the Kconfig fragments in kernel/configs and arch/*/configs
that aren't used internally aren't discoverable through "make help",
which consists of hard-coded lists of config fragments. Instead, list
all the fragment targets that have a "# Help: " comment prefix so the
targets can be generated dynamically.
Add logic to the Makefile to search for and display the fragment and
comment. Add comments to fragments that are intended to be direct targets.
Signed-off-by: Kees Cook
Co-developed-by: Masahiro Yamada
Acked-by: Michael Ellerman (powerpc)
Reviewed-by: Nicolas Schier
Signed-off-by: Masahiro Yamada
