Merge "Remove ununsed 'using namespace std'" into main am: 39fede2d9c

Original change: https://android-review.googlesource.com/c/platform/hardware/ril/+/3098158

Change-Id: I01002825548685b69803154adb55270ff30db407
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>