Wrong CenterPoint configs

[Byte247]

Hello, I just noticed that you pillar based centerpoint configs have the wrong number of PFE layers. Your have only a single [64] layer. This is correct for PointPillars, however as you can see in the original CenterPoint github, they use two PFE layers [64,64].

This results in a major performance drop on your version, which is important if someone wants to train their own comparison baselines using your Repo.