kernel/usb4bsd: Sync urtwn(4) with current FreeBSD.

This adds support for several (RTL8188EU based) adapters, among other
changes.

It should also fix the hangs we were seeing (using usb_pause_ls()

kernel/usb4bsd: Sync urtwn(4) with current FreeBSD.

This adds support for several (RTL8188EU based) adapters, among other
changes.

It should also fix the hangs we were seeing (using usb_pause_ls() now).

Thanks to Max Herrgaard <herrgaard@gmail.com> for testing it on a
RTL8188EU based adapter and to Christian Koch <cfkoch@sdf.lonestar.org>
for testing it with a RTL8188CU based one (Adafruit USB WiFi).

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