prima: revert scan optimizations to support concurrency

git://codeaurora.org/external/wlan/prima.git



commit 1a5942e30953311dce805e6b3b473bf1baea2c2d
Author: Jeff Johnson <jjohnson@codeaurora.org>
Date:   Wed Sep 19 08:54:34 2012 -0700

    prima: Scan optimizations to support concurrency

    New Features:
    1. Sessionize SME scan cache
    2. Separate beacon & porbe rsp entry for PE scan cache
    3. Enable scan break down logic in SME for multi-session

    Fixes:
    The change fixes issue with host initiated scans interferring with WFD
    connection and causing jitter in the video stream on the WFD
    connection.  This partially addresses b/7138968.

Signed-off-by: Iliyan Malchev <malchev@google.com>