ARM: dts: msm: Allow only wfi based on USB irq load for msmfalcon

Add pm-qos latency(i.e CPU-CLUSTER-WFI-LEVEL latency + 1) to be voted
by USB driver to allow only WFI during peak data transfers for msmfalcon
to improve performance.

Change-Id: I40a86a062910253401dc4a59f7ae84c518eebb5e
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>