cpu: Remove reduntant protobuf includes

Change-Id: Ic34b94b3a2ea951bc023cfce2d09ce304a602e41
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/11512
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>

cpu-tester: Refactoring traffic generators into separate files.

Change-Id: I2372a0a88e276dcb0c06c3d0a789e010cfba8013
Reviewed-by: Matteo Andreozzi <matteo.andreozzi@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/5722
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>