ti_config_fragments: rpmsg: Enable OMAP remoteproc watchdog support

Enable the Watchdog timer support for the OMAP remoteproc driver. This
enables the OMAP remoteproc driver to recovery any remote processor
executions stuck in a loop. This also mandatas that that all the IPU
and DSP firmwares to be used with the OMAP remoteproc driver support
the Watchdog timers and are petting the corresponding dmtimers to avoid
a recurring reboot of that processor.

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