msm: clock-8974: Add support for additional USB3 clocks

The USB3 driver needs to control a few additional clocks
for its operation. Three of these are sourced from the sleep
clock, and one from the USB3 master clock. Add support for
these new branches.

Change-Id: Ibf2bf352ae400d5f17f0c87680a99178c39b1411
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>