Merge tag 'u-boot-imx-20210616' of https://gitlab.denx.de/u-boot/custodians/u-boot-imx

u-boot-imx-20210616
-------------------

- imxrt : fixes, USB, imxrt1020-evk
- imx8m:
	fix for verdin-imx8mm
	Add conga-QMX8 board
- imx6 :
	documentation for pico-imx6:
	Add SeeedStudio NPI-IMX6ULL Support
	ventana: DM PCI
- imx7d:
	added SMEGW01 board

CI : https://source.denx.de/u-boot/custodians/u-boot-imx/-/pipelines/7765