arm: dts: k3-j721e: Fix interconnect node names

arm: dts: k3-j721e: Fix interconnect node names

The various CBASS interconnect nodes on K3 J721E SoCs are defined
using the node name "interconnect". This is not a valid node name
as per the dt-schema. Fix these node names to use the standard name
used for SoC interconnects, "bus".

Signed-off-by: Suman Anna <s-anna@ti.com>