Revert "usb: dwc3: core: configure TX/RX threshold for DWC3_IP"

This reverts commit 7932afa9.

It broke the Android kernel ABI and can be brought back in the future
in an ABI-safe way if needed.

Bug: 332277393
Change-Id: I10abcbf5237536b0ee382d3db16a5ebd82b3222c
Signed-off-by: Giuliano Procida <gprocida@google.com>