Staging: wlan-ng: fix most of the style issues in hfa384x.h

This patch fixes all the errors and the majority of the warnings found with
checkpatch.pl script in hfa384x.h, following Gábor Stefanik hints

Signed-off-by: Alessandro Ghedini <al3xbio@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>