[riscv-config] Update PMP definitions in cv32q65x spec (!2401) · Merge requests · OpenHW Group / backup-20241120 / cva6

Created by: zchamski

Align the specification of the PMPADDRn and PMPCFGn registers of CV32A65X on current design:

all 64 PMP entries are accessible
only 8 lowest-numbered entries are modifiable
PMP entries 8 through 63 are read-only zero.
bits 6:4 of lowest 8 PMPnCFG fields (located in PMPCFG0 and PMPCFG1) are read-only zero.

[riscv-config] Update PMP definitions in cv32q65x spec