riscv: dts: sophgo: Enable SPI NOR node for PioneerBox

riscv: dts: sophgo: Enable SPI NOR node for PioneerBox

Enable SPI NOR node for PioneerBox device tree

According to PioneerBox schematic, SPI-NOR Flash cannot support QSPI
due to hardware design. Thus spi-(tx|rx)-bus-width must be set to 1.

Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Tested-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Zixian Zeng <sycamoremoon376@gmail.com>
Link: https://lore.kernel.org/r/20250916-sfg-spidts-v2-2-b5d9024fe1c8@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>