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/dev/arm/generic_timer.cc

@@ -1584,27 +1584,3 @@ GenericTimerMem::timerCtrlWrite(Addr addr, size_t size, uint64_t data,
              "(0x%x:%i), assuming WI\n", addr, size);
     }
 }
-
-SystemCounter *
-SystemCounterParams::create() const
-{
-    return new SystemCounter(*this);
-}
-
-GenericTimer *
-GenericTimerParams::create() const
-{
-    return new GenericTimer(*this);
-}
-
-GenericTimerFrame *
-GenericTimerFrameParams::create() const
-{
-    return new GenericTimerFrame(*this);
-}
-
-GenericTimerMem *
-GenericTimerMemParams::create() const
-{
-    return new GenericTimerMem(*this);
-}