Documentation: Remove Kconfig.tex and related infrastructure

This part of our documentation has bitrotted for a long time.
Any remaining information should ideally be moved to
Documentation/getting_started/kconfig.md.

Change-Id: I3920d002813c2838285446dc0ed8dacfa5364581
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/28665
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

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