Update deprecated APIs to prepare for Chisel 5

- `IO` was moved from `chisel3.experimental` to `chisel3`
- `DataMirror` was moved from `chisel3.experimental` to `chisel3.reflect`

generators/chipyard/src/main/scala/SpikeTile.scala

@@ -2,7 +2,7 @@ package chipyard
 
 import chisel3._
 import chisel3.util._
-import chisel3.experimental.{IntParam, StringParam, IO}
+import chisel3.experimental.{IntParam, StringParam}
 
 import org.chipsalliance.cde.config._
 import freechips.rocketchip.subsystem._

generators/chipyard/src/main/scala/clocking/ClockGroupCombiner.scala

@@ -2,7 +2,7 @@ package chipyard.clocking
 
 import chisel3._
 import chisel3.util._
-import chisel3.experimental.{Analog, IO}
+import chisel3.experimental.Analog
 
 import org.chipsalliance.cde.config._
 import freechips.rocketchip.subsystem._

generators/chipyard/src/main/scala/clocking/TileClockGater.scala

@@ -2,7 +2,7 @@ package chipyard.clocking
 
 import chisel3._
 import chisel3.util._
-import chisel3.experimental.{Analog, IO}
+import chisel3.experimental.Analog
 
 import org.chipsalliance.cde.config._
 import freechips.rocketchip.subsystem._

generators/chipyard/src/main/scala/clocking/TileResetSetter.scala

@@ -2,7 +2,7 @@ package chipyard.clocking
 
 import chisel3._
 import chisel3.util._
-import chisel3.experimental.{Analog, IO}
+import chisel3.experimental.Analog
 
 import org.chipsalliance.cde.config._
 import freechips.rocketchip.subsystem._

generators/chipyard/src/main/scala/iobinders/IOBinders.scala

@@ -1,7 +1,8 @@
 package chipyard.iobinders
 
 import chisel3._
-import chisel3.experimental.{Analog, IO, DataMirror}
+import chisel3.reflect.DataMirror
+import chisel3.experimental.Analog
 
 import org.chipsalliance.cde.config._
 import freechips.rocketchip.diplomacy._