HDMI audio can be enabled over AM62A-SK using the same DT overlay that
is used for AM625 / AM62-LP SK-EVMs.

Add the sk.dtb + hdmi-audio.dtbo combination for AM62A7-SK as well, to
check for overlay applicability during DTBS compile tests.
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20240201125452.1920623-4-a-bhatia1@ti.comSigned-off-by: Vignesh Raghavendra <vigneshr@ti.com>