Try closing PFDs sent in map after binder call

- Iterate through all PFDs sent by caller after the binder call to send
  to system-server is complete. This prevents any potential leakages if
  the client does not close the FDs themselves.

Bug: 347173075
Test: cts
Change-Id: I06652b561d3548f7d5ec976b7a787e9c6c3d0b74