Include KReclaimable meminfo field into getMemInfo results

With new KReclaimable stat available in /proc/meminfo include it in
getMemInfo results so that it can be accounted in dumpsys meminfo reports.

Bug: 138148041
Test: dumpsys meminfo
Change-Id: Id475fcc0a63c6fc12ea64e08cec5cd24c83848a5
Signed-off-by: Suren Baghdasaryan <surenb@google.com>