nn: remove unnecessary types These may have been needed earlier in our port but are not needed now. Removing to reduce drift with upstream. BUG=b:165801983 TEST=FEATURES=test emerge-betty aosp-frameworks-ml-nn Change-Id: I75e2e875c65a25eb3afbc4ec8c8133db94426ba8 Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/frameworks/ml/+/2387860 Tested-by: Jim Pollock <[email protected]> Auto-Submit: Jim Pollock <[email protected]> Commit-Queue: Stuart Langley <[email protected]> Reviewed-by: Stuart Langley <[email protected]>