usb: dwc3: Use HIRD and LPM parameters from upstream

Upstream changes added similar device tree bindings for
specifying HIRD and LPM NYET threshold values. Use those
instead and remove the bindings we added. Make the switch
in the existing device trees as well.

Change-Id: I646eab14e8b7f4bebd48b189859ba10b8ea20aa3
Signed-off-by: Jack Pham <jackp@codeaurora.org>