ARM64: DT: Hisilicon SoCs DT updates for 5.1

* Hi6220 SoC and related boards:
  - Add DMA entries to enable DMA for Bluetooth transfers
  - Add power-on delay to make wifi stable
  - Revert HS200 mode to avoid eMMC controller resets and block read failures

* Hi3660 SoC and related boards:
  - Fix SD card detection via setting cd-gpios correctly

* Hi3798 SoC and related boards:
  - Fix malformed SPDX license identifier

* tag 'hisi-arm64-dt-for-5.1v2' of git://github.com/hisilicon/linux-hisi:
  arm64: dts: hikey: Revert "Enable HS200 mode on eMMC"
  arm64: dts: hikey: Give wifi some time after power-on
  arm64: dts: hi3798cv200: fix malformed SPDX license identifier
  arm64: dts: hikey960: fix SDcard detection
  arm64: dts: hikey: Add DMA entries for Bluetooth UART
Signed-off-by: Arnd Bergmann <arnd@arndb.de>