Revert "dumpstate: use pretty uptime, now in ABT"

This reverts commit f8193123.

Reason for revert:

> For ABT, I think the change is OK since we just extract the next line and show it in the UI. But there are some other places which has the assumption on the uptime format.

Change-Id: Iade14b70fbda032f74fb40900a61c112afecdb58