Add Radxa E24C; vendor kernel and vendor u-boot only for now

[rpardini]

Add Radxa E24C; vendor kernel and vendor u-boot only for now

• rockchip64-edge (6.18): enable Realtek DSA switches (NET_DSA_REALTEK_RTL8365MB)
  • for the Radxa E24C
• Add Radxa E24C; vendor kernel and vendor u-boot only for now
  • vendor stuff boots, mostly works
  • edge started, using Kwiboo's tree, but not enabled
    • u-boot mostly works, but needs rework against v2026.01
    • revisit after 6.19
      • rk3528 pcie already landed
    • the RTL8367RB switch vs the GMAC might need more work
• rockchip64_common: rk3528: add ROCKUSB_BLOB

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[rpardini]

Wait for:

• spl_loader at https://github.com/armbian/rkbin/pull/41
• vendor kernel at https://github.com/armbian/linux-rockchip/pull/436

[github-actions[bot]]

✅ This PR has been reviewed and approved — all set for merge!