soc: common: riscv-privileged: align to no SW ISR table

In case of no SW ISR table, `_isr_wrapper` does not exist.
Do not use it for exception handling.
Future improvements might include setting it to a user-defined handler.

Signed-off-by: Marcin Szymczyk <marcin.szymczyk@nordicsemi.no>
1 file changed