staging: brcm80211: remove PHYSADDR macro from dma.c

Four macros with PHYSADDR name prefix are not doing a lot and
complicate code readability. These have been expanded in the source
code and consequently removed the definitions.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@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>