external-sourcery-toolchain: remove
As per discussion on the mailing list [1], remove this largely
unmaintained external toolchain support in favour of the maintained
version in meta-sourcery [2].
Also correct the example and documentation.conf entries for TCMODE to
match up with this change.
[1] http://lists.openembedded.org/pipermail/openembedded-core/2013-December/087133.html
[2] https://github.com/MentorEmbedded/meta-sourcery/
(From OE-Core rev:
7603b15415301679bccbcb89af688c211704a43a)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>