The sscofpmf extension allows counter overflow and filtering for
programmable counters. Enable the perf driver to handle the overflow
interrupt. The overflow interrupt is a hart local interrupt.
Thus, per cpu overflow interrupts are setup as a child under the root
INTC irq domain.
Signed-off-by: NAtish Patra <atish.patra@wdc.com>
Signed-off-by: NAtish Patra <atishp@rivosinc.com>
Signed-off-by: NPalmer Dabbelt <palmer@rivosinc.com>