Fix: java process gets included in native section of meminfo dump

The window between collecting java processes and cpu stats is too
big, some java processes could get started during that window and
get included into the native section of the meminfo dump.

Bug: 139449460
Test: Manual
      1) Power cycle the device, and right after powering up:
      2) adb shell dumpsys meminfo
Change-Id: I846b0b9d19303f749752637fbcf767de4222a2fe