Explicitly use -I$S/external/bsd/dwc2/dist for dwc2 instead of possibly
getting that include path via DRM. Fixes evbmips cavium kernel build.

Reduce diff to upstream by using

sys/external/bsd/{include/workqueue.h,linux/linux_work.c}

This also fixes CI20 dwctwo start up as reported by macallan@

Improve USB debugging with USBHIST based on KERNHIST.

Convert some DPRINTFs to USBHIST_LOG and allow usbdebug, ehcidebug and
umassdebug to be changed via sysctl.

Remove the #define mess in usb.h.

Improve USB debugging with USBHIST based on KERNHIST.

Convert some DPRINTFs to USBHIST_LOG and allow usbdebug, ehcidebug and
umassdebug to be changed via sysctl.

Remove the #define mess in usb.h.

This was started by mrg@ and updated by reinoud@

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Adapt the Synopsys DWC2 driver to NetBSD.

Still work-in-progress