dt-bindings: interrupt-controller: Add SOPHGO SG2002 plic

dt-bindings: interrupt-controller: Add SOPHGO SG2002 plic

Add compatible string for SOPHGO SG2002 Platform-Level Interruter
Controller.

Signed-off-by: Thomas Bonnefille <thomas.bonnefille@bootlin.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://wiki.sipeed.com/hardware/en/lichee/RV_Nano/1_intro.html
Reviewed-by: Inochi Amaoto <inochiama@outlook.com>
Link: https://lore.kernel.org/r/20240711-sg2002-v4-1-d97ec2367095@bootlin.com
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>