Validate request metadata before coverting to camera metadata am: df9ea6e6

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/20918704



Change-Id: I2479b00f72ed1e9478113aed26417cd95c2bc4a4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>