Use explicit .c_str() for hidl_string
am: c620a935eb

Change-Id: I6a60a33b57b5b34732995b3b7374b935d40f3a7b
tree: 7181f0c5addc841aba59377ea190068d52137085
  1. wifi/
  2. Android.bp
  3. update-makefiles.sh