HACK: arm64: dts: ti: k3-am68-sk-base-board: Disable DSI

commit 8f7f371be250809e9c4af879cfa31d5f1839257d from
git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git



Disable the node for DSI as it is not functional due to wrong
pixel clock from SYSFW.

Signed-off-by: Jayesh Choudhary <j-choudhary@ti.com>
Signed-off-by: Xulin Sun <xulin.sun@windriver.com>