Merge https://gitlab.denx.de/u-boot/custodians/u-boot-fsl-qoriq

- device-tree sync-up with Linux for ls1028a
- fixes/update in fsl-ddr driver, fsl-validate, lx2162a, fsl-mc,
  spintable code, configs, qspi node, pci
- enable EFI_SET_TIME support in sl28
- powerpc: Drop -mstring