arm64: soc: ZynqMP SoC changes for v5.6

- Extend firmware interface for feature checking
- Use mailbox for communication with firmware for power management

arm64: dts: zynqmp: DT changes for v5.6

- Switch from fixed to firmware based clock driver
- Wire power domain driver
- Wire all ina226 chips through IIO and IIO hwmon drivers
- Add missing dr_mode property to usb nodes
- Use gpio-line-names property instead of comments
- Use clock-output-names for si570 differentiation
- Minor DT fixes

ARM: Xilinx Zynq SoC patches for v5.6

- Fix cpuid handling logic in platform SMP startup code

ARM: dts: zynq: DT changes for v5.6

- Enable coresight topology for Zynq

ARM: dts: zynq: DT changes for v5.6 v2

- Enable coresight topology for Zynq

arm64: soc: Xilinx SoC changes for v5.5

- Extend firmware interface to cover Versal chip

arm64: dts: zynqmp: DT changes for v5.5

- Add firmware node with fpga and nvmem support

Tagged for xlnx_rebase_v4.19_2019.2

Tagged for xilinx-v2019.2.01

ARM: Xilinx Zynq SoC patches for v5.4

- Add support for SMP in thumb mode
- Fix SMP trampoline code when FORTIFY_SOURCE is enabled