[Bug 264673] aw_if_dwc does not support current versions of u-boot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264673

            Bug ID: 264673
           Summary: aw_if_dwc does not support current versions of u-boot
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: arm
          Assignee: freebsd-arm@FreeBSD.org
          Reporter: src-2016@bikker.homeunix.net

Created attachment 234692
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234692&action=edit
aw_if_dwc and rgephy patch for rgmii-id mode

Current u-boot uses phy connection mode "rgmii-id" for some boards.
Driver aw_if_dwc.c does not support that and erroneously falls back to mii
mode.
This breaks network access for several boards including allwinner a20.
Failure verified on pcduino3-nano with dwc boot message:

dwc0: Can't reset DWC.

2 problems:
First: src/sys/arm/allwinner/aw_if_dwc.c incorrectly assumes that fdt supplied
phy-mode is always "mii", unless it literally is "rgmii". For supplied phy-mode
"rgmii-id" it falls back to default "mii" and selects wrong clock.
Remedy is simple - instead of 'strcmp(phy_type, "rgmii")' check for any rgmii
interface version via 'strncmp(phy_id, "rgmii" ,5)'. which matches also
"rgmii-id".

Second: None of the phy drivers support rgmii-id.
The supplied patch adds rgmii-id support for rgephy (realtek 8211E).

This was tested to work on pcduino3-nano

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