[Bug 215862] Zynq/Zedboard USB driver can panic if it has trouble initializing phy.

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215862

            Bug ID: 215862
           Summary: Zynq/Zedboard USB driver can panic if it has trouble
                    initializing phy.
           Product: Base System
           Version: CURRENT
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: thoma555-bsd at yahoo.com

Created attachment 178608
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178608&action=edit
patch

The Zedboard has a hardware bug where initialization of the USB PHY
occasionally fails on boot-up.  In 11-RELEASE, the driver would gracefully
detach if the error occurred but in -CURRENT it panics.

I've attached a fix.

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