linux-phytec-ti

ARM: dts: am57xx-idk-common: Enable PRU-ICSS and the child PRU nodes

The two PRU-ICSS processor subsystem bus nodes and all their associated
child PRU nodes were left in disabled state in the base dra7.dts file.
The PRU-ICSSs are supported on only the AM57xx SoCs, and are now enabled
for both the supported AM572x and AM571x IDK boards.

The corresponding nodes can be disabled later on if there is no
use-case defined to use a remote PRU core or a PRU-ICSS subsystem
if both its PRU cores are unused.

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