ASoC: OMAP: Update Makefile and Kconfig for HDMI audio

Update Makefile and Kconfig to build HDMI audio support for
OMAP4 SDP and Panda boards.

Signed-off-by: Ricardo Neri <ricardo.neri@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@ti.com>