aosp-frameworks-ml-nn: fix vendor hal loading With the implementation of multi-HAL loading (crrev.com/c/3007637), it actually breaks the ability to load vendor HALs (ie, intel-nnhal). This CL cleans up the dependencies and structure slightly to allow the installed libvendor-nnhal.so from other packages to override the default one. BUG=b:196007189 TEST=USE=vendor-nnhal emerge-volteer aosp-frameworks-ml-nn Change-Id: I7e0224ceca8b8904cea37996733e40b040004ad2 Reviewed-on: https://chromium-review.googlesource.com/c/aosp/platform/frameworks/ml/+/3083669 Tested-by: Jim Pollock <[email protected]> Auto-Submit: Jim Pollock <[email protected]> Commit-Queue: Jim Pollock <[email protected]> Reviewed-by: Michael Olney <[email protected]>