Revert "usb: dwc3: gadget: combine unaligned and zero flags"

This reverts commit 420b1237.

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

Reverted due to BootTimeRunner regression.

Change-Id: I412da53e0813d9964bdf42a2facd271d7cafd746
Signed-off-by: Ivaylo Georgiev <irgeorgiev@codeaurora.org>