net: wirelss:bcmdhd revert roaming patch

1) The patch was needed for roaming patch in the FW.
However, we need to revert this code because we revert
the roaming patch in new FW(7.35.79.49)
2) Bug : 18541286
Signed-off-by: Ecco park <eccopark@broadcom.com>

Change-Id: I66123f0911670a66e923353ae112d492a3b3869a