soc: ti: pruss: Enable support for PRUSS-M subsystem on K3 AM62x SoCs

The K3 AM62x family of SoC has one PRUSS-M instance and it has two
Programmable Real-Time Units (PRU0 and PRU1). This does not support
Industrial Communications Subsystem features like Ethernet.

The existing pruss platform driver has been updated to support this
through a new AM62x specific compatible.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Link: https://lore.kernel.org/r/20220602120613.2175-4-kishon@ti.com