Merge "binder: Use variant for backend specific Parcel fields" am: a5aa099a49 am: bddea9364b am: 30416b59bc

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/2093365

Change-Id: I2a83eea8bcf8d67750d44449bf98d5a2a2c68db5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>