two more provisos that needed to use BurstLenSize

Change-Id: I991a3b7c549ffdbb776356313ccb202951dad0c6
first cut at bluesim test of MemSlaveEngine throughput, without the MemSlaveEngine

Change-Id: I0af8716ef2cd361a6d7b3b5eeb957c1fee443dc0
added MemSlaveEngine, matches PCIe performance now

Change-Id: Ibcb5764c7529a0a1e36eaf33d320ba8e0d4d6038
instrumented MemSlaveEngine to find bubble in write path

Change-Id: Ie28c5d808c27025ad120b084228f90f8a4ed6908
enable writeReq to be called earlier

Change-Id: Idac375f1a8d66ccf10781003563b11481fa7746a
dumpvars for first 10K cycles in memwrite_bluesim

Change-Id: Ifd130334951958ac40a4f56ca02e2c02a8d06eda
typedef DataBusWidth in HostInterface, so removing it from BsimTop.bsv

Change-Id: Ib40262ecd98d508c5941ec9142927e4841858b4c