Combined RV32VM & RV64VM coverage files

I made some corrections as well. There was a coverpoint Nopagefault which was checking the value of stval to detect if a fault have occurred or not. It was supposed to be accessing mtval & still it's not the correct approach to check if a fault has occured or not because it's not zeroed out by default. We didn't get any coverage misses because stval is always zero in our tests as traps aren't delegated for those cases.

Combined SV39 and SV48 canonical coverpoints Some of the crosses weren't checking against priv modes, therefore added that as well Removed mode from crosses as it is being checked in PageType_ No need for the ignore bin = mode.SV39 && PageType_d.tera Made a slight code reduction to misaligned_PPN coverpoint in VM_CBO Added ifndef SVADU_SUPPORTED for svnapot coverpoints, as are meant to check for faults when svnpot isn't supported