Mem: Make SimpleMemory single ported

This patch changes the simple memory to have a single slave port
rather than a vector port. The simple memory makes no attempts at
modelling the contention between multiple ports, and any such
multiplexing and demultiplexing could be done in a bus (or crossbar)
outside the memory controller. This scenario also matches with the
ongoing work on a SimpleDRAM model, which will be a single-ported
single-channel controller that can be used in conjunction with a bus
(or crossbar) to create a multi-port multi-channel controller.

There are only very few regressions that make use of the vector port,
and these are all for functional accesses only. To facilitate these
cases, memtest and memtest-ruby have been updated to also have a
"functional" bus to perform the (de)multiplexing of the functional
memory accesses.

src/mem/SimpleMemory.py

@@ -44,6 +44,6 @@ from AbstractMemory import *
 
 class SimpleMemory(AbstractMemory):
     type = 'SimpleMemory'
-    port = VectorSlavePort("Slave ports")
+    port = SlavePort("Slave ports")
     latency = Param.Latency('30ns', "Request to response latency")
     latency_var = Param.Latency('0ns', "Request to response latency variance")