cpu: Delete unnecessary create() methods.

These were added in changes which were created before create() methods
were mostly automated, but were checked in after the then unnecessary
create() methods were purged.

Change-Id: I03da797ae8328fab6ef6b85dbc4ea86b34512fd5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/42743
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/cpu/testers/gpu_ruby_test/cpu_thread.cc

@@ -43,12 +43,6 @@ CpuThread::CpuThread(const Params &p)
     assert(numLanes == 1);
 }
 
-CpuThread*
-CpuThreadParams::create() const
-{
-    return new CpuThread(*this);
-}
-
 void
 CpuThread::issueLoadOps()
 {

src/cpu/testers/gpu_ruby_test/dma_thread.cc

@@ -48,12 +48,6 @@ DmaThread::~DmaThread()
 
 }
 
-DmaThread*
-DmaThreadParams::create() const
-{
-    return new DmaThread(*this);
-}
-
 void
 DmaThread::issueLoadOps()
 {

src/cpu/testers/gpu_ruby_test/gpu_wavefront.cc

@@ -48,12 +48,6 @@ GpuWavefront::~GpuWavefront()
 
 }
 
-GpuWavefront*
-GpuWavefrontParams::create() const
-{
-    return new GpuWavefront(*this);
-}
-
 void
 GpuWavefront::issueLoadOps()
 {

src/cpu/testers/gpu_ruby_test/protocol_tester.cc

@@ -357,9 +357,3 @@ ProtocolTester::SeqPort::recvTimingResp(PacketPtr pkt)
 
     return true;
 }
-
-ProtocolTester*
-ProtocolTesterParams::create() const
-{
-    return new ProtocolTester(*this);
-}