usb: dwc3: msm: clear resource on dwc3_msm_probe defer

In dwc3_msm_probe, when need to defer probe, driver should clear
resource has been allocated and de-attach the children device.
of_platform_depopulate is the complement of of_platform_populate to
remove devices created here. And driver also needs to destroy
workqueue in error case.

Change-Id: I234198eba45842f86c736dd459096ebc4fced807
Signed-off-by: Ziqi Chen <ziqic@codeaurora.org>