Merge tag 'xilinx-for-v2020.04-rc4' of https://gitlab.denx.de/u-boot/custodians/u-boot-microblaze

Xilinx fixes for v2020.04-rc4

- Fix link good bit handling in dp83867
- Rename generic Zynq defconfig
- Fix zybo z7 low leve setup
- Fix error path in zynq_gem driver and fix 64bit usage
- Fix invalid clock name quieries for Versal
- Fix zynq/zynqmp SPL low level configuration via DT selection