RFC: Behavior of make *config

Hi everybody,

I updated Kconfig to track latest Linux last week and that brought some behavioral change with it. While these changes are appreciated in some respect, they also complicate work in others.

I now proposed https://review.coreboot.org/79298, a change that exempts _all_ *config targets from strict symbol checking under the assumption that any attempt to edit a config should work even if the old configuration is unclean. It will save a clean copy if it saves on exit.

A regular build will still fail with an error like this:

/home/pgeorgi/coreboot/.config:152:warning: unknown symbol: VBT_DATA_SIZE_KB

ERROR: 1 warnings encountered, and warnings are errors.

make[1]: *** [build/util/kconfig/Makefile.real:76: olddefconfig] Error 1
make: *** [Makefile:219: build/config.h] Error 2

Running `make olddefconfig` manually (that is, explicitly stating that you want to run the command) would clean it up.

Now, given that this is a rather big semantic change, I wanted to make sure that the wider community can provide their input on how to approach this issue properly.

Before last week, only `make oldconfig` was exempt from checking, and the checks made by the other *config targets were much more lenient. With this approach, all *config targets clean up the config (and will do so silently, which might be a concern!) but when the config isn't right, the build will fail, and loudly.

Thoughts?

Regards,
Patrick
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