Stream file system is wrapper for Relayfs - a Linux specific feature,
which provides efficient method to indicate data to user space. It
depends on qdf debugfs APIs. This feature is protected with
compilation flags WLAN_STREAMFS and WLAN_DEBUGFS.
Change-Id: I1401112ece290e6d0560623cf10faaf498ebb1b7
CRs-Fixed: 2635481
