staging: ft1000 : replace __attribute ((__packed__) with __packed

Replace two instances of __attribute ((__packed__) with __packed macro
to address the warning found by the checkpatch.pl tool.

Signed-off-by: Geoff Darst <geoffda@comcast.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>