Exempt-From-Owner-Approval: Remove projects being moved into from system/core into system/memory

The following directories are being moved into separate projects under
system/memory:
  platform/system/memory/libion
  platform/system/memory/libmeminfo
  platform/system/memory/libmemtrack
  platform/system/memory/libmemunreachable
  platform/system/memory/lmkd

Remove them from system/core.

Bug: 141634854