Include both RSS and PSS info in MemItem protobuf dump

Bug: 117880513
Test: adb shell incident meminfo | incident_report -i -
Test: cts-tradefed run cts-dev --module \
      CtsIncidentHostTestCases --test \
      com.android.server.cts.MemInfoIncidentTest

Change-Id: I5445418f037004d66f1ec44fd91dd394f3776ca4