Simple renaming: CPUOldState -> CPUArchState where relevant.

This patch changes a few headers and sources to match upstream when
distinguishing between CPUArchState and CPUOldState (which will become
CPUState soon). For now, both types are identical so this should not
change the generated binaries at all.

Change-Id: I738b4ccaf75838a5931538dd52d1873750f1b816
6 files changed