Openrisc Features and Fixes for qemu 2.10

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# gpg:                using RSA key 0xC3B31C2D5E6627E4
# gpg: Good signature from "Stafford Horne <shorne@gmail.com>"
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* shorne/tags/pull-or-20170504:
  target/openrisc: Support non-busy idle state using PMR SPR
  target/openrisc: Remove duplicate features property
  target/openrisc: Implement full vmstate serialization
  migration: Add VMSTATE_STRUCT_2DARRAY()
  target/openrisc: implement shadow registers
  migration: Add VMSTATE_UINTTL_2DARRAY()
  target/openrisc: add numcores and coreid support
  target/openrisc: Fixes for memory debugging
  target/openrisc: Implement EPH bit
  target/openrisc: Implement EVBAR register
  MAINTAINERS: Add myself as openrisc maintainer
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>