microblaze tune: change microblazeeb to microblaze

microblaze tune: change microblazeeb to microblaze

Using microblazeeb breaks a number of autoconf recipes, including newlib
components.  'microblaze' is defined as the big-endian version, while
microblazeel is defined as the little-endian version.

config.sub: 2018-07-03

...
        | maxq | mb | microblaze | microblazeel | mcore | mep | metag \
...
        | microblaze-* | microblazeel-* \
...
        microblaze*)
                basic_machine=microblaze-xilinx
...

Signed-off-by: Mark Hatle <mark.hatle@xilinx.com>
Signed-off-by: Mark Hatle <mark.hatle@kernel.crashing.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>