removed loadstore example

Change-Id: Ib5ff91e19dcd9a077dcb62f42a6852b31f97a3fa
Added synthesizeable wrapper around mkPortalTop for Pcie targets to enable partial reconfiguration.

Two new top modules added, StdPcieDmaTop.bsv and StdPcieTop.bsv, depending on whether DMA is used.

In non-DMA project Makefile:
   DMA =
   Pins = Std

In DMA project Makefile:
   DMA = Dma
   Pins = Std

This causes the proper top module to be used.

Change-Id: Ib23e0cb6281773c6238df74a361ecdc3b868bf8f