arm: mach-k3: j721s2_init: Initialize AVS Class 0

Adaptive Voltage Scaling (AVS) Class 0 is a procedure for lowering the
voltage on certain device power rails. Initialize AVS Class 0.

Link: https://www.ti.com/lit/pdf/spruj28 (Section 5.2.3.3.2.5 AVS-Class0)
Signed-off-by: Manorit Chawdhry <m-chawdhry@ti.com>
Reviewed-by: Aniket Limaye <a-limaye@ti.com>
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