Tidy OOME message.

1) Make fragmentation reporting not occur for LOS allocations.
2) Don't report bytes allocated in alloc and LOS as the free bytes are what
   matter and are already reported. The alloc and LOS sizes should have had
   units and describe bytes in the image and Zygote - but really, all you care
   about are free bytes.

Change-Id: I53ad8744e07f2087a174ed650d10ee45f46a60b3