Merge remote-tracking branch 'remotes/xtensa/tags/20160714-xtensa' into staging

Xtensa-related fixes:

- fix FLASH interface width for XTFPGA boards.

# gpg: Signature made Thu 14 Jul 2016 12:00:05 BST
# gpg:                using RSA key 0x51F9CC91F83FA044
# gpg: Good signature from "Max Filippov <[email protected]>"
# gpg:                 aka "Max Filippov <[email protected]>"
# Primary key fingerprint: 2B67 854B 98E5 327D CDEB  17D8 51F9 CC91 F83F A044

* remotes/xtensa/tags/20160714-xtensa:
  target-xtensa: xtfpga: fix FLASH interface width

Signed-off-by: Peter Maydell <[email protected]>