[PATCH v1 0/3] Add Luckfox Omni3576 Carrier Board support for RK3576

[John Clark <inindev@gmail.com>]

This series adds device tree support for the Luckfox Omni3576 Carrier Board
with Core3576 Module, developed by Shenzhen Luckfox Technology Co., Ltd., based
on the Rockchip RK3576 SoC. The board supports various peripherals, with this
initial implementation enabling essential functionality for booting Linux and
basic connectivity.

Supported and tested features (on Linux 6.15-rc4):
- UART: Serial console operational.
- SD card: Mounts and reads/writes successfully.
- PCIe: NVMe SSD detected via lspci.
- Ethernet 0: Functional with RGMII PHY.
- USB: Host ports detect devices.
- RTC: Timekeeping and wake-up tested.
- LED: Heartbeat trigger works.

Disabled features:
- eMMC: Not populated on the tested board; believed to be functional but disabled.
- HDMI: Disabled due to mainline driver maturity issues (basic 1080p output works; audio and 4K untested).
- Ethernet 1: Disabled as it does not come up, possibly due to PHY configuration or driver issues.

Patch 1: Add luckfox vendor prefix for Shenzhen Luckfox Technology Co., Ltd.
Patch 2: Add luckfox,omni3576 binding to rockchip.yaml
Patch 3: Add rk3576-luckfox-omni3576.dts and Makefile update

The new DTS is covered by the existing ROCKCHIP ARCHITECTURE entry in MAINTAINERS.

I am aware of ongoing RK3576 upstreaming efforts (e.g., by Collabora) and
welcome feedback or collaboration to align with mainline driver development.

Signed-off-by: John Clark <inindev@gmail.com>