localmodconfig: Add missing $ to reference a variable

That is clearly what the original intention was. This does not change the
output .config but it prevents some useless processing.

! eq "m" is changed to the simpler eq "y"; symbols with values other than
m|y are not included in %orig_configs.

Link: http://lkml.kernel.org/r/1460333193-16361-3-git-send-email-bpoirier@suse.com



Signed-off-by: Benjamin Poirier <bpoirier@suse.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>