directfb.inc: enable bfd linker workaround for all arm targets
Although the gold linker problems with DirectFB have only so far been
observed with armv7a, they could potentially affect future arm targets
too. Since there's no particular downside to using the bfd linker for
DirectFB, apply the workaround to all arm targets.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
