Start recording wakeup reasons in battery history.

Depends on a modification to libsuspend so that we can get
a callback each time the device wakes up, to read the current
wakeup reasons from the kernel.  These are then stuffed in
to a new field in the battery history.

Also add new dump options --history-start and --charged
to better control what is dumped.

Finally the alarm manager uses a "*walarm*" tag for history
item wake locks that are coming from a wakeup alarm.

Change-Id: I457571973d5b2b5fdc4e4b63ab16275db20d7edd