fbdev_window: init FbDevNativeWindow::m_usage

Signed-off-by: Adrian Negreanu <adrian.m.negreanu@intel.com>
Merge branch 'master' of https://github.com/libhybris/libhybris
Add hardware_legacy/audio_policy_conf.h to the extracted headers.

Signed-off-by: Marko Saukko <marko.saukko@jollamobile.com>