arm64: dts: ti: k3-j784s4-main: Add audio_refclk node

On J784S4 SoC, the AUDIO_REFCLK1 can be used as input to external
peripherals when configured through CTRL_MMR.
Add audio_refclk1 node which would be used as system clock for
audio codec PCM3168A.

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Link: https://lore.kernel.org/r/20240626101645.36764-3-j-choudhary@ti.com


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