Merge remote-tracking branch 'remotes/xtensa/tags/20170306-xtensa' into staging

target/xtensa updates:

- instantiate local memories in xtensa sim machine;
- add two missing include files to xtensa core importing script.

# gpg: Signature made Mon 06 Mar 2017 22:32:45 GMT
# gpg:                using RSA key 0x51F9CC91F83FA044
# gpg: Good signature from "Max Filippov <filippov@cadence.com>"
# gpg:                 aka "Max Filippov <max.filippov@cogentembedded.com>"
# gpg:                 aka "Max Filippov <jcmvbkbc@gmail.com>"
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20170306-xtensa:
  target/xtensa: add two missing headers to core import script
  target/xtensa: sim: instantiate local memories

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