ARM: dts: msm: enable SSR support in rmnet_ipa

Make changes to enable SSR functionality in rmnet_ipa
driver to support Modem SSR on MDM9640.

Change-Id: I75ef86871fc7baf32797d80c579cae09de00b4d2
Acked-by: Chaitanya Pratapa <cpratapa@qti.qualcomm.com>
Signed-off-by: Sridhar Ancha <sancha@codeaurora.org>