staging: brcm80211: replaced wlc_ by brcms_c_, part 2

Code cleanup. Function renaming. Triggered by feedback comment from John
Linville, just like the other function renames that preceded this patch.

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