Allow reset vector to be set dynamically

A chip's power-up sequence, or awake-from-sleep sequence, may wish to
set the reset PC based upon dynamic properties, e.g., the settings of
external pins.  Support this by passing the reset vector to the Coreplex.
ExampleTop simply hard-wires the reset vector, as was the case before.

Additionally, allow MTVEC to *not* be reset.  In most cases, including
riscv-tests, pk, and bbl, overriding MTVEC is one of the first things
that the boot sequence does.  So the reset value is superfluous.

src/main/scala/coreplex/Coreplex.scala

@@ -58,6 +58,7 @@ abstract class Coreplex(implicit val p: Parameters, implicit val c: CoreplexConf
     val debug = new DebugBusIO()(p).flip
     val clint = Vec(c.nTiles, new CoreplexLocalInterrupts).asInput
     val success: Option[Bool] = hasSuccessFlag.option(Bool(OUTPUT))
+    val resetVector = UInt(INPUT, p(XLen))
   }
 
   def hasSuccessFlag: Boolean = false
@@ -153,6 +154,7 @@ class DefaultCoreplex(tp: Parameters, tc: CoreplexConfig) extends Coreplex()(tp,
       tile.io.interrupts.seip.foreach(_ := plic.io.harts(plic.cfg.context(i, 'S')))
       tile.io.interrupts.debug := debugModule.io.debugInterrupts(i)
       tile.io.hartid := i
+      tile.io.resetVector := io.resetVector
     }
 
     val tileSlavePorts = (0 until tc.nTiles) map (i => s"int:dmem$i") filter (ioAddrMap contains _)