linux-phytec-ti

ARM: dts: beagle-x15-common: Enable PRU-ICSS and the child PRU nodes

The two PRU-ICSS processor subsystem bus nodes and all their associated
child 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 in
all the supported BeagleBoard-X15 and AM57xx GP EVM 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>