support/kconfig: remove useless patch

Patches 02-cpp-comments-to-c-comments.patch changes C++-style comments
into C-style comments.

This is unneeded, since gcc accepts C++-style comments in C code anyway.

Ditch that patch, that's one less we have to handle when updating from
upstream.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>