kbuild: document recursive dependency limitation / resolution

Recursive dependency issues with kconfig are unavoidable due to
some limitations with kconfig, since these issues are recurring
provide a hint to the user how they can resolve these dependency
issues and also document why such limitation exists.

While at it also document a bit of future prospects of ways to
enhance Kconfig, including providing formal semantics and evaluation
of use of a SAT solver. If you're interested in this work or prospects
of it check out the kconfig-sat project wiki [0] and mailing list [1].

[0] http://kernelnewbies.org/KernelProjects/kconfig-sat
[1] https://groups.google.com/d/forum/kconfig-sat

Cc: Geert Uytterhoeven <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Paul Bolle <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Takashi Iwai <[email protected]>
Cc: "Yann E. MORIN" <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Mate Soos <[email protected]>
Signed-off-by: Luis R. Rodriguez <[email protected]>
Signed-off-by: Michal Marek <[email protected]>

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