Merge "Make ReadDmabufHeapPoolsSizeKb/HeapTotalExportedKb fall back to ION" am: 581444840d am: 217e83acb2 am: ee5cfc01c2

Original change: https://android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/1619803

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ie714ac60b8699c09622e4c4e073e0ea41a1f51c1