kernel/usb4bsd: Bring in the axge(4) ethernet driver.

It supports USB Gigabit Ethernet adapters based on the
ASIX Electronics AX88179 USB 3.0 and AX88178A USB 2.0
chipsets.

Taken-from: FreeBSD
drm: linux/io.h is really asm/io.h, rename it

While there, also add ioremap() and ioremap_wc() to the new file
date(1): Add "-R" flag to use RFC 2822 date and time output format

As stated in the man page, this is equivalent to use
"%a, %d %b %Y %T %z" as the output format while LC_TIME is set to the
"C" locale.

This is compatible with date(1) from the GNU core utilities.

Taken-from: FreeBSD

While here, remove $DragonFly$ line from man page.