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[Karel Gardas]

This patch series creates 6.1 config directory and updates its files
to not use any from 6. It also updates 6's GCC to GCC 12 (gcc-head)
to easy testing and comparing for gcc 10 and 12 in preparation
of RTEMS 6.1 release.
General idea is that we will create config/<RTEMS release version>
for any RTEMS release and that way keep tools and kernel releases
in sync forever. E.g. '6' and '7' are for branch/master developments
but '6.1', '6.2', '7.1' etc. are kept intact after the release.