riscv: andes_plic.c: use modified IPI scheme

The IPI scheme in OpenSBI has been updated to support 8-core AE350
platform, the plicsw configuration needs to be modified accordingly.

Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Rick Chen <rick@andestech.com>
1 file changed