arm64: dts: ti: k3-am642-evm: Rename regulator node name

Rename the regulator node names to the standard regulator-0.. numbers.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20230414073328.381336-9-nm@ti.com


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