riscv: dts: sophgo: Add initial device tree of Sophgo SRD3-10

Sophgo SG2044 SRD3-10 board bases on Sophgo SG2044 SoC.
This board includes 5 uart ports, 5 pcie x8 slots, 1 1G Ethernet port,
1 microSD slot.

Add initial device tree of this board with uart support.

Link: https://lore.kernel.org/r/20250413223507.46480-11-inochiama@gmail.com


Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>