ARM: dts: msm: Add smcinvoke node for mdm9607

SMCInvoke driver should be a platform driver instead of char/misc
driver. Adding smcinvoke node to support that.

Change-Id: I5f35a62bf4f863e335dec5fbeac1ccafa1fd9640
Signed-off-by: Dinesh K Garg <dineshg@codeaurora.org>