video: vidconsole: avoid multiple lines overwrite logo

Fix the bug that multiple lines wraps to overwrite logo bmp
display.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # bpi-m1+, bpi-m64