arm64: dts: ti: j721e-main: add timesync_router node

The Time Sync Event Router (TIMESYNC_INTRTR0) implements a set of
multiplexers to provide selection of active CPTS time sync events for
routing to CPTS capable modules.
The TIMESYNC_INTRTR0 module has the following configuration:
 • Number of input events: 55
 • Number of output events: 40
 • Event input type: Pulse

This patch adds DT node TIMESYNC_INTRTR0 using "pinctrl-single" bindings.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>