Add missing cloneType methods to pin bundles

src/main/scala/devices/i2c/I2CPins.scala

@@ -12,6 +12,9 @@ class I2CPins[T <: Pin](pingen: () => T) extends Bundle {
   val scl: T = pingen()
   val sda: T = pingen()
 
+  override def cloneType: this.type =
+    this.getClass.getConstructors.head.newInstance(pingen).asInstanceOf[this.type]
+
   def fromI2CPort(i2c: I2CPort, clock: Clock, reset: Bool, syncStages: Int = 0) = {
     withClockAndReset(clock, reset) {
       scl.outputPin(i2c.scl.out, pue=true.B, ie = true.B)

src/main/scala/devices/pwm/PWMPeriphery.scala

@@ -18,6 +18,9 @@ class PWMPins[T <: Pin] (pingen: ()=> T, val c: PWMParams) extends Bundle {
 
   val pwm: Vec[T] = Vec(c.ncmp, pingen())
 
+  override def cloneType: this.type =
+    this.getClass.getConstructors.head.newInstance(pingen, c).asInstanceOf[this.type]
+
   def fromPWMPort(port: PWMPortIO) {
     (pwm zip port.port)  foreach {case (pin, port) =>
       pin.outputPin(port)

src/main/scala/devices/spi/SPIPins.scala

@@ -7,9 +7,12 @@ import sifive.blocks.devices.pinctrl.{PinCtrl, Pin}
 
 class SPIPins[T <: Pin] (pingen: ()=> T, c: SPIParamsBase) extends SPIBundle(c) {
 
-  val sck: T      = pingen()
-  val dq: Vec[T]  = Vec(4, pingen())
-  val cs: Vec[T]  = Vec(c.csWidth, pingen())
+  val sck = pingen()
+  val dq  = Vec(4, pingen())
+  val cs  = Vec(c.csWidth, pingen())
+
+  override def cloneType: this.type =
+    this.getClass.getConstructors.head.newInstance(pingen, c).asInstanceOf[this.type]
 
   def fromSPIPort(spi: SPIPortIO, clock: Clock, reset: Bool,
     syncStages: Int = 0, driveStrength: Bool = Bool(false)) {

src/main/scala/devices/uart/UARTPeriphery.scala

@@ -44,6 +44,9 @@ class UARTPins[T <: Pin] (pingen: () => T) extends Bundle {
   val rxd = pingen()
   val txd = pingen()
 
+  override def cloneType: this.type =
+    this.getClass.getConstructors.head.newInstance(pingen).asInstanceOf[this.type]
+
   def fromUARTPort(uart: UARTPortIO, clock: Clock, reset: Bool, syncStages: Int = 0) {
     withClockAndReset(clock, reset) {
       txd.outputPin(uart.txd)