Add dmabuf RSS and PSS to low memory report

In addition to normal process PSS, add two columns for dmabuf RSS and
PSS:

ActivityManager:   ntv      ??   89525       0       0: zygote (pid 658) native
ActivityManager:   ntv      ??   38557       0       0: zygote64 (pid 657) native
ActivityManager:   ntv      ??   36396       0       0: webview_zygote (pid 2911) native
ActivityManager:   ntv      ??   33735   24816   13591: surfaceflinger (pid 765) native
ActivityManager:   ntv      ??   22466       0       0: media.swcodec (pid 822) native
ActivityManager:   ntv      ??   18977       0       0: mediaserver (pid 816) native
ActivityManager:   ntv      ??   14854   27496   16853: android.hardware.graphics.composer3-service.ranchu (pid 667) native

If the procfs files for dmabuf_rss and dmabuf_pss do not exist, then -1 is reported.

Flag: NONE logging
Test: adb shell am kill-all
Bug: 424645186
Change-Id: Ie6deb65d5f81b194695b01169aa0bd14ed6122ff