dt-bindings: irqchip: pruss-intc: Update bindings for K3 J721E SoCs

The K3 J721E SoCs have a revised version of the ICSSG IP present on K3
AM65x SoCs. The ICSSG interrupt controller is identical to that of the
INTC on AM65x SoCs despite the presence of two additional Tx_PRU cores,
and supports 20 host interrupts and 160 input events from various SoC
interrupt sources. Update the PRUSS interrupt controller bindings for
this INTC on J721E SoCs.

Signed-off-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Roger Quadros <rogerq@ti.com>

Documentation/devicetree/bindings/interrupt-controller/ti,pruss-intc.txt

@@ -27,6 +27,7 @@ Required Properties:
                              "ti,am5728-pruss-intc" for AM57xx family of SoCs
                              "ti,k2g-pruss-intc" for 66AK2G family of SoCs
                              "ti,am654-icssg-intc" for K3 AM65x family of SoCs
+                             "ti,j721e-icssg-intc" for K3 J721E family of SoCs
 - reg                  : base address and size for the PRUSS INTC sub-module
 - interrupt-controller : mark this node as an interrupt controller
 - #interrupt-cells     : should be 1. Client users shall use the PRU System