Revert "net: wireless: bcmdhd: new feature for Roaming."

This reverts commit 8e8b58daa69ec6c932495de531dce3dde1e97297.

Conflicts:
	drivers/net/wireless/bcmdhd/dhd.h
	drivers/net/wireless/bcmdhd/dhd_sdio.c
	drivers/net/wireless/bcmdhd/wl_cfg80211.c