Add the detailed DRAM model into M5. See the /mem/timing/DRAM_M5.txt for discussion on setting paramaters.

SConscript:
    Add support for detailed DRAM model

--HG--
extra : convert_revision : b65f9a810fa95957b585c85632ac20f9283337d1

SConscript

@@ -137,6 +137,9 @@ base_sources = Split('''
 	mem/cache/tags/split_lifo.cc
 	mem/functional/functional.cc
 	mem/timing/base_memory.cc
+        mem/timing/dram_memory.cc
+        mem/timing/dram_mem_bank.cc
+        mem/timing/dram_memory_builder.cc
 	mem/timing/memory_builder.cc
 	mem/timing/simple_mem_bank.cc
         mem/trace/itx_writer.cc