ARM: dts: msm: Disable modem pil loading from SMD driver

SMD driver triggers the modem image loading by voting
to the peripheral image loader(pil).

Disable the modem pil loading from SMD driver to support
the Peripheral manager which handles the modem loading.

Change-Id: Ic7f34bd9a255be34c18c2a3bb8ddf738885c43eb
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>