Revert "usb: dwc3: gadget: move requests to cancelled_list"

This reverts commit d7ff2e3f.

This is a preparation change for merging android-4.19.57 into
msm-4.19 branch.

Reverted due to BootTimeRunner regression.

Change-Id: I70a700d11631f32a6ddad7443ce1fcbccdccf479
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>