ARM: dts: msm: Disable modem pil loading from mproc code for mdm9607

The smd and ipc-router drivers trigger the loading of the modem via
calls to subsystem_get. Since modem loading is handled by Power Save
Mode(PSM) feature, disable loading the modem from SMD & IPC Router drivers.

Change-Id: I133e8321173cf17a1d4cd4f5f26dc26ad26bb25f
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>