debuggerd: Set timeout on native proc trace collection

This will unblock the handler thread of ActivityManager
in case debuggerd goes awry during trace collection of
native procs. Debuggerd will timeout in 3 seconds if
native proc doesn't respond. ActivityManager will block
for 5 seconds at the most for each native proc. The
number of native processes of interest has also gone up
from 3 to 10 in N.

Change-Id: I754f912c409fdf29f427b11763927405fbf877b4
Signed-off-by: Shibin George <shibing@codeaurora.org>