arm64: zynqmp: SoC CLK changes for v4.20

This patchset adds CCF compliant clock driver for ZynqMP.
Clock driver queries supported clock information from firmware
and regiters pll and output clocks with CCF.

arm64: zynqmp: SoC changes for v4.20

- Adding firmware API for SoC with debugfs interface
  Firmware driver communicates to Platform Management Unit (PMU) by using
  SMC instructions routed to Arm Trusted Firmware (ATF). Initial version
  adds support for base firmware driver with query and clock APIs.

  EEMI spec is available here:
  https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf

ARM: Xilinx Zynq SoC patches for v4.20

- Convert to using %pOFn instead of device_node.name in slcr driver

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

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

arm64: zynqmp: SoC changes for v4.20

- Adding firmware API for SoC with debugfs interface

arm: dts: zynqmp: DT changes for v4.19

- Use serdev for BT in zcu100
- Remove ep108
- Fix gpio-keys binding
- Add suport for Ultra96

ARM: dts: zynq: DT changes for v4.19

- Add Z-turn board
- Add mmc aliases
- Fix model information
- Sort out documentatio
- Update Zybo Z7
- Fix gpio-keys

arm: zynqmp: DT changes for v4.19

- Use serdev for BT in zcu100
- Remove ep108
- Fix gpio-keys binding
- Add suport for Ultra96

arm: zynq: DT changes for v4.19

- Add Z-turn board
- Add mmc aliases
- Fix model information
- Sort out documentatio
- Update Zybo Z7
- Fix gpio-keys

Tagged for xlnx_rebase_v4.14_2018.2