hw/arm/nseries: don't print to stdout or stderr

Remove various bits of printing to stdout or stderr from the
nseries code, replacing it with a qemu log message where there's
an appropriate log category, and just dropping the output for
some of the more debug-like printing.

In particular, this will get rid of the 'mipid_reset' message
you currently get from 'make check'.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Message-id: 1363368565-24546-1-git-send-email-peter.maydell@linaro.org
