ARM: multi_v7_defconfig: Enable OMAP audio/display support

We would like to support some additional OMAP class devices using the
common multi_v7_defconfig. To start, enable some audio/display related
modules:

DRM_OMAP/OMAP5_DSS_HDMI: For base DRM display support.
DRM_TI_TFP410: Used as a display bridge for several EVM's panels.
DRM_TI_TPD12S015: HDMI encoder on several OMAP/Sitara EVMs.
SND_SOC_TLV320AIC3X_I2C: For I2C attached TLV320AIC3x codecs.

Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>