usb: dwc3: update HP timer as per new usb 3.1 ECN

This is the workaround for STAR 9001198391 which affects
dwc3 core version 3.20a only.  DWC3 core version:3.20a
supports usb 3.1 hp timer ECN but incorrectly sets hp timer
timeout to 3us. Update hp timer to 11us to pass usb link
layer compliance test: TD 7.1, TD 7.9, TD 7.11, TD 7.13,
TD 7.14, TD 7.18, TD 7.23, TD 7.26, TD 7.27, TD 7.28, and
TD 7.29.

Change-Id: Icdbc1550e96a7dfcbe85604b8c237f0a8730bb23
Signed-off-by: Vamsi Krishna Samavedam <vskrishn@codeaurora.org>