Seeed reComputer: display and Ethernet fixes

[mingzhangqun]

Summary

Board-specific fixes for Seeed reComputer RK3576/RK3588 devkits, extracted from our Armbian extension patches. Referenced in armbian/build#9719.

Patches

• drm: rockchip: dw-dp: AUX recovery and EDID cache for USB-C DP Alt Mode — On RK3576 with USB-C DP Alt Mode, the AUX channel gets stuck after ~15s of active main link transmission. Adds reinit_completion() + retry with AUX module reset, and caches EDID to survive I2C-over-AUX failures.
• drm/rockchip: rk3576: switch DSI dclk_src from vpll to cpll — When both DP and DSI are active, DP reprograms vpll which breaks DSI. Switch DSI VP's dclk parent to cpll (1000MHz, supports 720x1280@60 exactly).
• drm/rockchip: dw-mipi-dsi2: set panel orientation before device registration — Fixes WARNING in __drm_mode_object_add() when DSI panel driver calls drm_connector_set_panel_orientation() from get_modes after DRM device registration.
• net: r8125 LED policy for Seeed boards — Sets LED0 (yellow) to blink on traffic at all link speeds, LED3 (green) solid on at all speeds. ⚠️ This modifies rtl_hw_start_8125_common() and affects all r8125 users — open to reworking via device tree or module parameter if preferred.

Testing

All patches tested on reComputer RK3576 DevKit with:

• USB-C DP Alt Mode hotplug / re-plug / display manager restart
• Simultaneous HDMI + DP + DSI output
• DSI panel (ili9881c) with portrait orientation
• r8125 Ethernet LED behavior

[HeyMeco]

As mentioned on armbian/build#9719 (comment). Best to rework the LEDs to the board device tree else 👍