kern-tools: allow 'y' or 'm' to avoid config audit warnings

kern-tools: allow 'y' or 'm' to avoid config audit warnings

   commit b627b8bd17501400649d38bf61c8a3d2121a1b8f (HEAD -> master,
   origin/master, origin/HEAD)
   Author: Bruce Ashfield <bruce.ashfield@gmail.com>
   Date:   Sun Sep 18 16:36:43 2022 -0400

       symbol_why: allow options to be flagged as built-in or module

       Some options that are hardware related, can either be built in or
       modules, and meet the criteria of being acceptable for a BSP.

       To allow these options to not throw warnings, we create a new
       configuration fragment to go along with the 'hardware.cfg' and
       'nonhardware.cfg' special fragments.

       This new fragment is called 'y_or_m_enabled.cfg' and is effective
       for the fragments in its directory. The format is the same as
       hardware/nonhardware.cfg, is simply a list of CONFIG_ options.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>