lmkd: Fix meminfo logs missing SwapTotal and having wrong field order

Previous change If154dc364711bf7c86f32e24ddcd10be359386de called
"lmkd: Do not downgrade/ignore events when swap is full" added SwapTotal
into meminfo structure without adding the field into events.logtag file.
This results in logs which missing field and all fields starting with
"SwapFree" get reordered as a result. Fix this by adding the missing field
into events.logtag.

Bug: 129274901
Test: Confirm correct information in the logcat
Change-Id: Ia4de3790a7e9d49a0e4cba8b3161a715eaf6532e
Signed-off-by: Suren Baghdasaryan <surenb@google.com>