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

The smd and ipc-router drivers trigger the loading of the modem via
calls to subsystem_get. We now disable this functionality for 8916/39
since power on of the modem is handled by the peripheral manager in
userspace.

Change-Id: I395a15bea18674c958ce7ceb9c7a8c72609b895a
CRs-Fixed: 842833
Signed-off-by: Swetha <schikk@codeaurora.org>