ARM: dts: omap3-gta04: add devconf1 setup for correct tvout pins

The VENC with external OPA362 amplifier needs a special
"pinmux" setup in DEVCONF1 (TVOUTBYPASS and TVOUTACEN).

Signed-off-by: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>