Define fetchBytes in HasCoreParams, not Frontend

It is more generally useful.

src/main/scala/rocket/Frontend.scala

@@ -75,7 +75,6 @@ class FrontendModule(outer: Frontend) extends LazyModuleImp(outer)
   val icache = outer.icache.module
   require(fetchWidth*coreInstBytes == outer.icacheParams.fetchBytes)
 
-  val fetchBytes = coreInstBytes * fetchWidth
   val tlb = Module(new TLB(true, log2Ceil(fetchBytes), nTLBEntries))
   val fq = withReset(reset || io.cpu.req.valid) { Module(new ShiftQueue(new FrontendResp, 5, flow = true)) }
 

src/main/scala/tile/Core.scala

@@ -54,6 +54,7 @@ trait HasCoreParameters extends HasTileParameters {
   val fetchWidth = coreParams.fetchWidth
   val decodeWidth = coreParams.decodeWidth
 
+  val fetchBytes = coreParams.fetchBytes
   val coreInstBits = coreParams.instBits
   val coreInstBytes = coreInstBits/8
   val coreDataBits = xLen max fLen