usb: phy-msm-qusb-v2: Reset PLL only if not locked on resume

Driver currently unconditionally resets PLL while entering
suspend state. As per hardware databook PLL need not to be
reset across every suspend/resume. Driver should reset it
only if PLL fails to lock on resume which must be checked
using DEBUG_CTRL2 register.

Change-Id: I4cb544dd8ad94af9270746f67ad872ff1b77e2b0
Signed-off-by: Manu Gautam <mgautam@codeaurora.org>