nn: move VTS / CTS to new package BUG=b:182254380 TEST=emerge-volteer aosp-frameworks-ml-nn-vts && cros deploy <DUT> Change-Id: I359f44a2c593aed181a3663b3e6378e06ff0ef30 Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/frameworks/ml/+/2745351 Tested-by: Jim Pollock <[email protected]> Auto-Submit: Jim Pollock <[email protected]> Commit-Queue: Stuart Langley <[email protected]> Reviewed-by: Stuart Langley <[email protected]>