ARM: dts: msm: Add low-latency for QRTR on SM8150

Some peripherals needs low latency communication requirements
over IPCRTR channel. Enable low-latency property for required
peripherals IPCRTR channel like SLPI and MODEM.

Change-Id: Iaf1670a3f09b4094cb33b6234a0097427143dd95
Signed-off-by: Arun Kumar Neelakantam <aneela@codeaurora.org>