USB: dwc3-msm: Add support for voting for PM_QOS_LATENCY

Add required changes to enable to vote for PM_QOS_LATENCY based on
number of interrupts fired during certain duration.

Change-Id: I92ace85ee7fd40c3f33f1b9f7bdd32469d990d84
Signed-off-by: Vijayavardhan Vennapusa <vvreddy@codeaurora.org>