misc: Delete the now unnecessary create methods.

Most create() methods are no longer necessary. This change deletes them,
and occasionally moves some code from them into the constructors they
call.

Change-Id: Icbab29ba280144b892f9b12fac9e29a0839477e5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/36536
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/gpu-compute/gpu_command_processor.cc

@@ -221,9 +221,3 @@ GPUCommandProcessor::shader()
 {
     return _shader;
 }
-
-GPUCommandProcessor*
-GPUCommandProcessorParams::create() const
-{
-    return new GPUCommandProcessor(*this);
-}