Reduce the coldboot timeout to 1s.

5s was already a ridiculously long time to delay booting, and some OEMs are
trying to make it even more insane:

  https://www.codeaurora.org/cgit/quic/la/platform/system/core/commit/?h=lp&id=fd23edd48272976d2fb333f377242173f92aa343

Let's at least ensure that Nexus and Android One devices don't take forever
to boot...

Bug: http://b/19899875
Change-Id: I9680c166a759360f34118e51cd0645e12b6bd5c8
(cherry picked from commit c7331d02)