samples: update the rpi sample

And use the newly introduced CT_ARCH_SUFFIX at the same time. :-)

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

reporter_name="Ioannis E. VENETIS"

reporter_url="http://sourceware.org/ml/crossgcc/2009-11/msg00109.html"

reporter_comment=""