Audio policy: remove using namespace std in header

Introduced by I1442a9dda1553e9ea7a4a654c50555ac1ec06aa0

Bug: 79417899
Test: m -j
Change-Id: I4d5a598ea1a376f12c133c0fc6a425a738da7a7a
Signed-off-by: Kevin Rocard <krocard@google.com>
2 files changed