arm64: dts: ti: k3-am62p-j722s: Add rng node

Add the node for the random number generator inside the crypto module.
Marked reserved since the default usage is with the RNG node being
controlled by OP-TEE.

Signed-off-by: Michael Walle <mwalle@kernel.org>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://lore.kernel.org/r/20250401083246.3228964-1-mwalle@kernel.org


Signed-off-by: Nishanth Menon <nm@ti.com>