libdmabufinfo: Remove GetDmabufAttachmentStats am: c38fff4473 am: 0c1fec27b7

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/memory/libmeminfo/+/15263761

Change-Id: Ic1ed2a3572d434fe2d5421882b1199e88bcb90d2