Fix video console newline and carriage return handling

Lines of the lenght CONSOLE_COLS or greater than CONSOLE_COLS
are not displayed correctly. This is an attempt to fix
this issue. Also add carriage return handling.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Rodolfo Giometti <giometti@linux.it>