USB: phy-msm: Add pm_qos and bus voting if host mode active

USB android driver takes care of pm_qos voting in device mode.
Add similar support for host mode in phy-msm-usb driver along
with voting for NOC clock in host mode dynamically based on USB
interrupts to improve host mode performance and also not affect
system power if USB is idle.

Change-Id: I7eca33e7023f97e2e14e1763bcd2133b7bacac09
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>