default or selected kernelversion does not have config value CONFIG_OMAP4_DSS_HDMI_AUDIO.
Result is shown for kernelversion 6.5.1

CONFIG_OMAP4_DSS_HDMI_AUDIO (not configurable)

configname: CONFIG_OMAP4_DSS_HDMI_AUDIO

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>OMAP2+ Display Subsystem support
└─>OMAP4_DSS_HDMI_AUDIO
In linux kernel since version 3.1 (release Date: 2011-10-24)