Merge tag 'zynq-dt-for-v4.20' of https://github.com/Xilinx/linux-xlnx into next/dt

ARM: dts: zynq: DT changes for v4.20

- Fix DTS spi/i2c warnings for zc702/zc770 boards

Signed-off-by: Arnd Bergmann <arnd@arndb.de>