ARM: dts: msm: Specify MSM8994 USB PM QOS levels

Add this property to android_usb device which specifies the latency
thresholds corresponding to WFI, CPU PC and cluster CCI power
collapse. This allows for CPUs to enter various C-states when
the USB cable is connected and based on bus inactivity levels,
and helps to reduce overall power consumption.

Change-Id: I93668d7fa3ba357f583b619f9b7c36b550f73838
Signed-off-by: Jack Pham <jackp@codeaurora.org>