staging: brcm80211: cleaned brcmu_utils.h

Code cleanup. Moved softmac specific definitions into brcmsmac/types.h
Removed unused definitions.

Signed-off-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>