Rename getIonMappedSizeKb to getDmabufMappedSizeKb am: 6ae0be89b9 am: 8ce7111610

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1576749

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2037b8b38eeac285f54973f1287494b146710539