configs: Port PlatformConfig to the common object list

Port PlatformConfig to use the common object list.

Change-Id: If62e596bf1f28b49994da3a2800450d163383755
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20593
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
5 files changed