ARM: Delete netx a second time

ARM: Delete netx a second time

Commit ceb02dcf676f ARM: delete netx machine deleted
the mach-netx machine. Then eight days later
it was resurrected by SPDX tag fixes. I think.

Taking the liberty to fix some additional debug uart
cruft.

Link: https://lore.kernel.org/r/20190721224157.6597-1-linus.walleij@linaro.org
Fixes: ceb02dcf676f ("ARM: delete netx machine")
Acked-By: Robert Schwebel <r.schwebel@pengutronix.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>