Clean up half sheet code

Pure clean up, no logic change at all.

1. Use TAG instead hard code string for log.
2. Remove unused code.
3. Fix some annotation.

Test: Build
Bug: 218771606
Change-Id: Ia1d2bad318901e38bcb246cac29c063d4da4f9d0
8 files changed
tree: aab07784f6fbeb7661c200e53ebfe724e20d8271
  1. nearby/