Support non-V, but with-vector implementations

Non-V will not have misa.V set, but should still execute V

src/main/scala/rocket/CSR.scala

@@ -913,7 +913,7 @@ class CSRFile(
       (!usingSupervisor.B || reg_mstatus.prv >= PRV.S.U || read_scounteren(counter_addr)) &&
       (!usingHypervisor.B || !reg_mstatus.v || read_hcounteren(counter_addr))
     io_dec.fp_illegal := io.status.fs === 0.U || reg_mstatus.v && reg_vsstatus.fs === 0.U || !reg_misa('f'-'a')
-    io_dec.vector_illegal := io.status.vs === 0.U || reg_mstatus.v && reg_vsstatus.vs === 0.U || !reg_misa('v'-'a')
+    io_dec.vector_illegal := io.status.vs === 0.U || reg_mstatus.v && reg_vsstatus.vs === 0.U || !usingVector.B
     io_dec.fp_csr := decodeFast(fp_csrs.keys.toList)
     io_dec.vector_csr := decodeFast(vector_csrs.keys.toList)
     io_dec.rocc_illegal := io.status.xs === 0.U || reg_mstatus.v && reg_vsstatus.xs === 0.U || !reg_misa('x'-'a')