mem: cleanup of the rowhammer code

This change cleans most of the non-important comments from the
hammersim codebase.

Change-Id: I316a067da79ca12c1e6dbb930887436237a687df
Signed-off-by: Kaustav Goswami <kggoswami@ucdavis.edu>

Author: kaustav-goswami

src/mem/DRAMInterface.py

@@ -116,6 +116,10 @@ class DRAMInterface(MemInterface):
         "named as `rowhammer.trace`",
     )
 
+    rh_stat_file = Param.String(
+        "m5out/rowhammer.trace", "output path of the rowhammer trace"
+    )
+
     # Single-sided rowhammer probability.
     single_sided_prob = Param.Unsigned(
         1e7,