configs: Port MemConfig to the common object list

Port MemConfig to use the common object list.

Change-Id: If421c2745ac3431718a5170314045b456fc64a90
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/20592
Tested-by: kokoro <noreply+kokoro@google.com>
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

configs/example/arm/starter_fs.py

@@ -56,6 +56,7 @@ import argparse
 m5.util.addToPath('../..')
 
 from common import SysPaths
+from common import ObjectList
 from common import MemConfig
 from common.cores.arm import HPI
 
@@ -214,7 +215,7 @@ def main():
     parser.add_argument("--num-cores", type=int, default=1,
                         help="Number of CPU cores")
     parser.add_argument("--mem-type", default="DDR3_1600_8x8",
-                        choices=MemConfig.mem_names(),
+                        choices=ObjectList.mem_list.get_names(),
                         help = "type of memory to use")
     parser.add_argument("--mem-channels", type=int, default=1,
                         help = "number of memory channels")