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

This reverts commit 47556276c59d0df4c2915d6c44b0d65f1a8b93e3.

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