linux-phytec-ti

dt-bindings: soc: ti: pruss: Update bindings for K3 AM65x SoCs

The K3 AM65x SoCs have the next generation of the PRU-ICSS IP, commonly
called ICSSG. The ICSSG IP on K3 SoCs has couple of additional sub-modules
(two IEP and MII_RT sub-modules each vs one, a new MII_G_RT sub-module)
w.r.t previous generation PRU-ICSS IPs. Update the PRUSS bindings for
these newer ICSSG instances including the info for MII_G_RT.

NOTE:
- The usage of the second IEP and MII_RT sub-module instances are yet
  to be determined, and so are yet to be added.

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