ARM64: DT: Hisilicon SoC DT updates for 4.13

- Add and update Hi3660-Hikey960 board, Hi3660 PCIe RC, Hi6421v530 MFD and
  Hi3660 MMC binding
- Add and refine devices support for Hi3660-Hikey 960 including clock, reset,
  I2C, GPIO, UART, Bluetooth, RTC, Power Key, LED, SPI, timer, PMIC, regulator,
  sd/sdio and WiFi
- Add k3-dma and i2s/hdmi audio support based on audio-card-graph method for
  Hikey board

* tag 'hisi-arm64-dt-for-4.13-v2' of git://github.com/hisilicon/linux-hisi: (21 commits)
  arm64: dts: hi6220: Add k3-dma and i2s/hdmi audio support
  arm64: dts: hi3660-hikey960: add nodes for WiFi
  arm64: dts: hi3660: add sd/sdio device nodes
  dt-bindings: mmc: dw_mmc-k3: add document of hi3660 mmc
  arm64: dts: hikey960: add device node for pmic and regulators
  dt-bindings: mfd: hi6421: Add hi6421v530 compatible string
  arm64: dts: hisi: add kirin pcie node
  dt-bindings: PCI: hisi: Add document for PCIe of Kirin SoCs
  arm64: dts: hi3660: add sp804 timer node
  arm64: dts: hi3660: add spi device nodes
  arm64: dts: hikey960: add LED nodes
  arm64: dts: hi3660: add power key dts node
  arm64: dts: hi3660: Add pl031 rtc node
  arm64: dts: hikey960: add WL1837 Bluetooth device node
  arm64: dts: hi3660: Add uarts nodes
  arm64: dts: hi3660: add gpio dtsi file for Hisilicon Hi3660 SOC
  arm64: dts: Add I2C nodes for Hi3660
  arm64: dts: hi3660: add resources for clock and reset
  arm64: dts: hikey960: pinctrl: add more pinmux and pinconfig
  arm64: dts: hisilicon: update compatible string for hikey960
  ...
Signed-off-by: Olof Johansson <olof@lixom.net>