[HDM] Add more synchronization

The only unprotected path among the 3 calls.

Bug: 146979641
Test: atest com.android.server.wifi
Change-Id: I6b57d8b5f68a3fd43ebf21252e3c1ae9c44c4d8a
1 file changed
tree: 844dafa889913361919aff1c1f8713872609bbe5
  1. apex/
  2. service/
  3. PREUPLOAD.cfg