wfDebugMem: Fix binary prefix and improve usability

* Fix: wfDebugMem no longer reports kibibytes as kilobytes
* Usability: wfDebugMem now uses unit symbols (e.g. KiB)

Change-Id: I1ab8aa3ccdb0fdea307913ada4ed42964d7fe960
Merge "wfDebugMem: Fix binary prefix and improve usability"