dt-bindings: arm: rockchip: Add Firefly ROC-RK3576-PC binding

dt-bindings: arm: rockchip: Add Firefly ROC-RK3576-PC binding

Add devicetree binding for the ROC-RK3576-PC SBC.

The board is based on the RK3576 SoC (4*Cortex-A72 + 4*Cortex-A53).

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20250210205126.1173631-2-heiko@sntech.de
[ upstream commit: 2be4a4171401761cb5fb02225d8b18351f6807c0 ]

(cherry picked from commit 89026942ddd0475d78b11b019285fff0c1d47266)
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>