Fix toBits/toUInt/toSInt deprecation warnings

uncore/src/main/scala/Util.scala

@@ -8,4 +8,18 @@ package object Util {
   
     def isOneOf(u1: UInt, u2: UInt*): Bool = isOneOf(u1 +: u2.toSeq)
   }
+
+  implicit class SeqToAugmentedSeq[T <: Data](val x: Seq[T]) extends AnyVal {
+    def apply(idx: UInt): T = {
+      if (x.size == 1) {
+        x.head
+      } else {
+        val half = 1 << (log2Ceil(x.size) - 1)
+        val newIdx = idx & UInt(half - 1)
+        Mux(idx >= UInt(half), x.drop(half)(newIdx), x.take(half)(newIdx))
+      }
+    }
+
+    def asUInt(): UInt = Cat(x.map(_.asUInt).reverse)
+  }
 }