Due to recent changes to the tune, in order to match config.guess, the name
of the big-endian microblaze architecture was changes to 'microblaze'.
(From OE-Core rev: 6f6a6bbac684ead3fe6d070d61f17c2f611a2c87)
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>