Merge https://gitlab.denx.de/u-boot/custodians/u-boot-mpc85xx into next

- Enable DM driver on ppc/km boards
- Enable DM_USB for some of NXP powerpc platforms: P5040, T4240, T208x,
  T104x, P4080, P2041, P2020, P1020, P3041
- Some updates in mpc85xx-ddr driver, km boards