dwc3: Move usage of ahb2phy read/write wait functionality to controller

Currently AHB2PHY read/write wait configuration is used with USB QMP PHY
driver before initializing it. It is suggested to use this functionality
before initializing both QUSB and QMP PHYs. Hence move this functionality
to MSM specific USB controller driver which makes sure to configure this
before initializing USB PHYs.

Change-Id: Ie281763e118c79717095fe68f27dca5491f687de
Signed-off-by: Mayank Rana <mrana@codeaurora.org>