chardev: Restore CR,LF on stdio

chardev: Restore CR,LF on stdio

Remove the 'stair-step output' on stdio.

This partially reverts commit 12fb0ac05, which was correct
on the mailing list but got corrupted by the maintainer :p

Introduced-by: [email protected]
Reported-by: BALATON Zoltan <[email protected]>
Reviewed-by: Thomas Huth <[email protected]>
Tested-by: Laurent Desnogues <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Message-id: 20180607210818[email protected]
Suggested-by: Thomas Huth <[email protected]>
Tested-by: Laurent Desnogues <[email protected]>
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>
Signed-off-by: Peter Maydell <[email protected]>