arm64: dts: ti: k3: squelch warning about lack of #interrupt-cells

There are couple of places where INTA interrupt controller
lacks #interrupt-cells property. This leads to warnings of
the type:

arch/arm64/boot/dts/ti/k3-j721e-main.dtsi:147.51-156.5: Warning (interrupt_provider): /bus@100000/main-navss/interrupt-controller@33d00000: Missing #interrupt-cells in interrupt provider

when building TI device-tree files with W=2 warning level.
Fix these.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Grygorii Strashko <grygorii.strashko@ti.com>
Link: https://lore.kernel.org/r/20201127210128.9151-1-nsekhar@ti.com