uboot-imx

Merge tag 'u-boot-imx-20190313' of git://git.denx.de/u-boot-imx

Small fixes in several i.MX boards
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- imx8: add pinctrl driveri (mx8m), fix documentation and
  fix reported CPU frequency. Fabio is co-maintainer
- pico-imx6ul: switch to DM
- local fixes for ventana, mx6ul_14x14_evk, engicam,
  imx6(q)_logic, liteboard