arm64: dts: ti: Fix HDMI Audio overlay in Makefile

Apply HDMI audio overlay to AM625 and AM62-LP SK-EVMs DT binaries,
instead of leaving it in a floating state.

Fixes: b50ccab9 ("arm64: dts: ti: am62x-sk: Add overlay for HDMI audio")
Reported-by: Rob Herring <robh@kernel.org>
Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Link: https://lore.kernel.org/r/20231003092259.28103-1-a-bhatia1@ti.com


Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>