dt-bindings: arm: ti: Add bindings for AM62A7 SoC

This adds bindings for TI's AM62A7 family of devices.

Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com>
Tested-by: Devarsh Thakkar <devarsht@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20220901141328.899100-3-vigneshr@ti.com