cache: fix cache instruction csr X state

src/main/scala/xiangshan/cache/CacheInstruction.scala

@@ -154,7 +154,7 @@ class CSRCacheOpDecoder(decoder_name: String, id: Int)(implicit p: Parameters) e
   val data_transfer_cnt = RegInit(0.U(log2Up(maxDataRowSupport).W))
 
   // Translate CSR write to cache op
-  val translated_cache_req = Reg(new CacheCtrlReqInfo)
+  val translated_cache_req                  = RegInit(0.U.asTypeOf(new CacheCtrlReqInfo))
   println("Cache op decoder (" + decoder_name + "):")
   println("  Id " + id)
   // CacheInsRegisterList.map{case (name, attribute) => {
@@ -298,4 +298,4 @@ class CSRCacheErrorDecoder(implicit p: Parameters) extends CacheCtrlModule {
     print_cache_error_flag(decoded_cache_error.opType.atom, "atom")
     printf("It should not happen in normal execution flow\n")
   }
-}
\ No newline at end of file
+}