Merge remote-tracking branch 'remotes/bkoppelmann/tags/pull-tricore-20150324' into staging

TriCore bugfixes for 2.3-rc1

# gpg: Signature made Tue Mar 24 08:48:33 2015 GMT using RSA key ID 6B69CA14
# gpg: Good signature from "Bastian Koppelmann <kbastian@mail.uni-paderborn.de>"

* remotes/bkoppelmann/tags/pull-tricore-20150324:
  target-tricore: properly fix dvinit_b/h_13
  target-tricore: fix RRPW_DEXTR using wrong reg
  target-tricore: fix DVINIT_HU/BU calculating overflow before result
  target-tricore: Fix two helper functions (clang warnings)

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