ARM: dts: sun5i: Add PocketBook 614 Plus support

What works:

- Serial console
- mmc0, mmc2 (both microSD card slots on the board)
- All buttons (gpio and lradc based)
- Power LED
- PMIC
- RTC
- USB OTG/gadgets mode

Signed-off-by: Denis Burkov <hitechshell@mail.ru>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://lore.kernel.org/r/20240415173416.13838-2-hitechshell@mail.ru


Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>