Lengthen the AM timeout reading crash reports slightly

We're missing some (small fraction of) native crash reports from
debuggerd.  It looks like under high system load the debuggerd
reporting code just isn't quite timely enough for the very short
timeouts initially deployed, so lengthen those a bit.

Bug 8552010

Change-Id: Icbc5b6517de3bb98fff1af2ea42ffd208ef20412