Respect --coredump flag when going RT

RIO doesn't have enough disk bandwidth to core dump, so let's not try.
THis is why we were doing it.

Change-Id: I403a116bbf52f2c1876ad7810c280a0810ab1c5d
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/aos/realtime.cc b/aos/realtime.cc
index c58e2e6..f8ab639 100644
--- a/aos/realtime.cc
+++ b/aos/realtime.cc
@@ -97,7 +97,6 @@
   SetSoftRLimit(RLIMIT_MEMLOCK, RLIM_INFINITY, SetLimitForRoot::kNo,
                 "use --skip_locking_memory to not lock memory.");
 
-  WriteCoreDumps();
   PCHECK(mlockall(MCL_CURRENT | MCL_FUTURE) == 0)
       << ": Failed to lock memory, use --skip_locking_memory to bypass this.  "
          "Bypassing will impact RT performance.";