[media] ARM: mach-omap2: board-rx51-peripherals: Add lirc-rx51 data

The IR diode on the RX51 is connected to the GPT9. This data is needed
for the IR driver to function.

Signed-off-by: Timo Kokkonen <timo.t.kokkonen@iki.fi>
Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>