riscv: dts: allwinner: d1: Add LED controller node

riscv: dts: allwinner: d1: Add LED controller node

Allwinner D1 contains an LED controller. Add its devicetree node, as
well as the pinmux used by the reference board design.

Acked-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Tested-by: Trevor Woerner <twoerner@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Link: https://patch.msgid.link/20231029212738.7871-5-samuel@sholland.org
[wens@kernel.org: move "status" to end of properties]
Signed-off-by: Chen-Yu Tsai <wens@kernel.org>