[hardware] Accept the instruction issue only if it's valid for Ara

hardware/src/ara_pre_decoder.sv

@@ -182,7 +182,7 @@ module ara_pre_decoder import ara_pkg::*; import rvv_pkg::*; #(
 
  logic inv_accept;
 
- assign cvxif_issue_resp_o.accept = ~insn_error;
+ assign cvxif_issue_resp_o.accept = is_decoding & ~insn_error;
  assign cvxif_issue_resp_o.writeback = (is_rd || is_fd);
  assign cvxif_issue_resp_o.register_read[0] = (is_rs1 || is_fs1);
  assign cvxif_issue_resp_o.register_read[1] = (is_rs2 || is_fs2);