Merge spl-2021-03-05

Change-Id: Id516404b234a3d3fb33f12e7264b91b24cdef2f4
tree: 1a8fa2d68feac248470388459167ef2e15b32103
  1. nn/
  2. .clang-format
  3. CleanSpec.mk
  4. CPPLINT.cfg
  5. OWNERS
  6. PREUPLOAD.cfg