MIPS patches 2017-02-24-2

CHanges:
* Add the Boston board with fixing the make check issue on 32-bit hosts.

# gpg: Signature made Fri 24 Feb 2017 11:43:45 GMT
# gpg:                using RSA key 0x2238EB86D5F797C2
# gpg: Good signature from "Yongbok Kim <yongbok.kim@imgtec.com>"
# gpg: WARNING: This key is not certified with sufficiently trusted signatures!
# gpg:          It is not certain that the signature belongs to the owner.
# Primary key fingerprint: 8600 4CF5 3415 A5D9 4CFA  2B5C 2238 EB86 D5F7 97C2

* remotes/yongbok/tags/mips-20170224-2:
  hw/mips: MIPS Boston board support

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>