CHROMIUM: CONFIG: Add debug info

CHROMIUM: CONFIG: Add debug info

This was default on all builds but got lost in a kernel rebase. It
adds no-overhead to release builds since they are stripped but means
the vmlinux we get from the bots has symbols.

BUG=chromium:222294
TEST=Build the kernel and run with it.  Use kgdb with this kernel.

Change-Id: Ief705b2a1a09917b6885ed84c7a405cb12e105f2
Signed-off-by: Doug Anderson <dianders@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/33566
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sonny Rao <sonnyrao@chromium.org>
Reviewed-by: Sameer Nanda <snanda@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>