Debuggerd: Extend crash_dump timeout to 5 seconds

Some processes have lots of threads and minidebug-info. Unwinding
these can take more than the original two seconds.

Bug: 62828735
Test: m
Test: debuggerd_test
Test: adb shell kill -s 6 `pid system_server`
Merged-In: I0041bd01753135ef9d86783a3c6a5cbca1c5bbad
Change-Id: I0041bd01753135ef9d86783a3c6a5cbca1c5bbad
(cherry picked from commit b02851a984)

debuggerd/crash_dump.cpp

@@ -267,7 +267,10 @@ int main(int argc, char** argv) {
   }
 
   // Die if we take too long.
-  alarm(2);
+  //
+  // Note: processes with many threads and minidebug-info can take a bit to
+  //       unwind, do not make this too small. b/62828735
+  alarm(5);
 
   std::string attach_error;