vexpress: Minor tidyups

- Remove unnecessary kernel args
- Remove Linaro wallpaper config (now done in common code)
- Update netconfig hack comment in init.arm-versatileexpress.rc

Change-Id: I1cbcd769fa4a3771e52833a16b6f28b5d56fec9a
Signed-off-by: Jon Medhurst <tixy@linaro.org>
3 files changed