misc: Use PARAMS

The patch is using the newly defined PARAMS macro to replace
custom params() getters in derived class.

The patch is also removing redundant _params:
Instead of creating yet another _params field, SimObject descendants
should use params() to expose the real type of SimObject::_params they
already have.

Change-Id: I43394cebb9661fe747bdbb332236f0f0181b3dba
Signed-off-by: Alexander Klimov <Alexander.Klimov@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39900
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>
120 files changed