kern-tools: improve kernel config audit output

Recent kernels broke the ability of kconfiglib to parse the Kconfig
files and offer reasons why a symbol may not be set. To address this
issue, we update to Kconfiglib2 and adjust the symbol_why script to
work with the new API.

We also tweak the kconf_check script to allow the specification of
a list of option as "non-hardware". This allows a BSP to inhibit
warnings on options that it knows are mismatched for a valid reason
(i.e. -tiny kernels using common fragments with known missing
dependencies).

Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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