arm64: dts: allwinner: A133: add basic support for Teclast P80 tablet

The Teclast P80 tablet is an 8 inch entry-level tablet from around 2020,
featuring an Allwinner A133 SoC. It features:
    - Allwinner A133 SoC (4*Arm Cortex-A53) at 1.6 GHz
    - 2 GiB LPDDR4 DRAM
    - 32GiB eMMC
    - microSD card slot
    - AXP707 PMIC
    - USB-C OTG port (also for charging)
    - 800x1200 pixel 8" IPS panel
    - unknown Bluetooth and WiFi
    - secure boot, but takes any key

Add initial support for the tablet, including UART, PMIC, eMMC, SD, USB.
The tablet uses secure boot, so it needs a signed TOC0 wrapped image to
boot, but it has no key hash burnt into the efuses, so it accepts an
image signed with any key.

Please note that there are older models also being named P80: a device
with an Mediatek SoC from around 2018, based on 32-bit ARM cores, and an
Intel Atom based one from around 2014.
This device here is sometimes listed as G4, the Mediatek one as G3.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Link: https://patch.msgid.link/20260914210115.28151-4-andre.przywara@arm.com
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>

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