drm/panel: st7703: Add AYANEO Pocket DS Lower Panel Support

Add support for the lower (secondary) panel of the AYANEO Pocket DS, a
dual-screen QCS8550 (Snapdragon 8 Gen 2) handheld. It is a 5.0" 1024x768
4:3 IPS LCD driven by a Sitronix ST7703 DDIC: every command in the vendor
init sequence maps to an ST7703 manufacturer command (SETEXTC, SETMIPI,
SETRGBIF, SETSCR, SETPOWER, SETGAMMA, SETGIP1/2), and the SETMIPI and
SETRGBIF payloads are near-identical to the already-supported Powkiddy
RGB10MAX3.

The panel is mounted in portrait (768x1024) and rotated 270 degrees in
the device, expressed through the panel rotation property. The SETEXTC
unlock password ends in 0x87 rather than the canonical 0x83; this is the
value shipped by the vendor firmware and is kept verbatim.

Init sequence extracted from the AYANEO Pocket DS BSP kernel, via the
ROCKNIX SM8550 port.

Signed-off-by: Alexandre Hamamdjian <azkali.limited@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patch.msgid.link/20260723-b4-st7703-pocketds-lower-v1-2-e3db246589f4@gmail.com

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