Merge "remove unneeded dontwarn settings" am: 738531af

Original change: https://android-review.googlesource.com/c/platform/build/+/2378047



Change-Id: I8c168de699d75980a6de0763b1dfbf8d26490da4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>