ARM: devicetree updates for v5.7

Most of the commits are for additional hardware support and minor fixes
for existing machines for all the usual platforms: qcom, amlogic, at91,
gemini, mediatek, ti, socfpga, i.mx, layerscape, uniphier, rockchip,
exynos, ux500, mvebu, tegra, stm32, renesas, sunxi, broadcom, omap,
and versatile.

The conversion of binding files to machine-readable yaml format
continues, along with fixes found during the validation.
Andre Przywara takes over maintainership for the old Calxeda Highbank
platform and provides a number of updates.

The OMAP2+ platforms see a continued move from platform data into
dts files, for many devices that relied on a mix of auxiliary data
in addition to the DT description

A moderate number of new SoCs and machines are added, here is a full
list:

- Two new Qualcomm SoCs with their evaluation boards: Snapdragon 865
  (SM8250) is the current high-end phone chip, and IPQ6018 is a new
  WiFi-6 router chip.

- Mediatek MT8516 application processor SoC for voice assistants, along
  with the "pumpkin" development board

- NXP i.MX8M Plus SoC, a variant of the popular i.MX8M, along with an
  evaluation board.

- Kontron "sl28" board family based on NXP LS1028A

- Eleven variations of the new i.MX6 TechNexion Pico board, combining
  the "dwarf", "hobbit", "nymph" and "pi" baseboards with i.MX6/i.MX7
  SoM carriers

- Three additional variants of the Toradex Colibri board family, all
  based on versions of the NXP i.MX7.

- The Pinebook Pro laptop based on Rockchip RK3399

- Samsung S7710 Galaxy Xcover 2, a 2013 vintage Android phone based on
  the ST-Ericsson u8500 platform

- DH Electronics DHCOM SoM and PDK2 rev. 400 carrier based on
  STMicroelectronics stm32mp157

- Renesas M3ULCB starter kit for R-Car M3-W+

- Hoperun HiHope development board with Renesas RZ/G2M

- Pine64 PineTab tablet and PinePhone phone, both based on Allwinner A64

- Linutronix Testbox v2 for the Lamobo R1 router, based on Allwinner A20

- PocketBook Touch Lux 3 ebook reader, based on Allwinner A13

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