arm64: dts: ti: k3-j721e-main.dtsi: Add VXE384 node

commit 49fa5eb15209f77ac7540300f0b7dcf74f91232d from
TI Linux SDK PROCESSOR-SDK-LINUX-J721E_07.03.00.05

Add VXE384 video encoder node for J721E.

Signed-off-by: Angela Stegmaier <angelabaker@ti.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Sidraya Jayagond <sidraya.bj@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>