staging: brcm80211: removed sys directory layer from brcmsmac driver

Based on review comments moved sources from brcm80211/brcmsmac/sys
to its parent directory. The phy directory is kept for maintainance
logistics around phy source code.

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