core: remove default values in parameters

The top level should pass all parameter down.

src/main/scala/uk/ac/soton/ecs/can/core/CanCoreConfiguration.scala

@@ -3,8 +3,8 @@ package uk.ac.soton.ecs.can.core
 case class CanCoreConfiguration(
     programMemoryWords: Int,
     dataMemoryWords: Int,
-    syncReadMemory: Boolean = true,
-    regAfterBlockInitializer: Boolean = true,
-    regBetweenRounds: Boolean = true,
-    regAfterAdder: Boolean = true
+    syncReadMemory: Boolean,
+    regAfterBlockInitializer: Boolean,
+    regBetweenRounds: Boolean,
+    regAfterAdder: Boolean
 )

src/main/scala/uk/ac/soton/ecs/can/core/DataMemory.scala

@@ -9,7 +9,7 @@ class DataMemory(
     addrWidth: Int,
     dataWidth: Int,
     size: Int,
-    syncMem: Boolean = true
+    syncMem: Boolean
 ) extends MultiIOModule {
   val read = IO(
     Vec(

src/main/scala/uk/ac/soton/ecs/can/core/ProgramMemory.scala

@@ -9,7 +9,7 @@ class ProgramMemory(
     addrWidth: Int,
     cwWidth: Int,
     nWords: Int,
-    syncMem: Boolean = true
+    syncMem: Boolean
 ) extends MultiIOModule {
   val br = IO(new Bundle {
     val abs = Input(Bool())