riscv: dts: sophgo: Use common "interrupt-parent" for all peripherals for sg2042

As all peripherals of sg2042 share the same "interrupt-parent",
there is no need to use peripherals specific "interrupt-parent".
Define "interrupt-parent" in the SoC level.

Reviewed-by: Chen Wang <unicorn_wang@outlook.com>
Tested-by: Chen Wang <unicorn_wang@outlook.com>
Link: https://lore.kernel.org/r/IA1PR20MB49531F6DFD2F116207C1397DBBB72@IA1PR20MB4953.namprd20.prod.outlook.com


Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>