Fix Verilog Prerequisites + Ignore mv stdout (#1406)

* Fix Ibex vlog compilation deps | Ignore mv stderr

* Init DRAMSim2

* Use size_t in cospike.cc

* Use size_t in spiketile.cc

scripts/build-toolchain-extra.sh

@@ -113,6 +113,7 @@ fi
 
 echo '==>  Installing DRAMSim2 Shared Library'
 cd $RDIR
+git submodule update --init tools/DRAMSim2
 cd tools/DRAMSim2
 make libdramsim.so
 cp libdramsim.so $RISCV/lib/