usb: dwc3-msm: Fix restart usb work functionality

Commit 18cd8089 ("usb: dwc3-msm: Make power collapse
and power-on-reset mandatory") removed the device tree properties
for power-collapse due to which the dwc3_restart_usb_work() which
was supposed to do a full POR sequence by simulating a cable
disconnection-reconnection sequence now only does a dbm reset.
Fix this, so that dwc3_restart_usb_work(), does a full POR.

CRs-Fixed: 975249
Change-Id: Iaabe9283ec80954a2e504a55f2b4cdf93ca8ae46
Signed-off-by: Azhar Shaikh <azhars@codeaurora.org>