@Maki_SM
Edit: I see what you mean now. Looks like sound configuration was not added into the DTB.
Can you please test this DTB (rename to dtb.img and place in root of SD card) and let me know if you get the option for HDMI, SPDIF and PCM?
g12a_s905x2_Xg.zip (33.8 KB)
In CE each sound device is separate.
You need to change the passthrough device to HDMI.