staging: brcm80211: rename macros in dhd_dbg.h

The header file dhd_dbg.h contains several macros used throughout
the code starting with DHD_. These have been renamed to get rid
of this broadcom specific acronym.

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