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/cpu/SConscript

@@ -119,5 +119,4 @@ Source('timing_expr.cc')
 SimObject('DummyChecker.py')
 SimObject('StaticInstFlags.py')
 Source('checker/cpu.cc')
-Source('dummy_checker.cc')
 DebugFlag('Checker')