misc: Tidy up M5OP_FOREACH and the constants in m5ops.h.

misc: Tidy up M5OP_FOREACH and the constants in m5ops.h.

Make sure all the operations that have constants (and aren't deprecated
or reserved) and present in M5OP_FOREACH in order of their constants.
Also move M5OP_ANNOTATE up so that all the constants are also in order.

Change-Id: I8d9f69b020aeb39311a24606a286a76de10a51cc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/27234
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>