Documentation: kbuild: explain handling optional dependencies

This problem frequently comes up in randconfig testing, with
drivers failing to link because of a dependency on an optional
feature.

The Kconfig language for this is very confusing, so try to
document it in "Kconfig hints" section.

Reviewed-by: Javier Martinez Canillas <[email protected]>
Reviewed-by: Sakari Ailus <[email protected]>
Reviewed-by: Nicolas Schier <[email protected]>
Signed-off-by: Arnd Bergmann <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>

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