board: freescale: Replace invalid usage of sprintf by strcat

buf was used as destination and as parameter to sprintf
which triggers an undefined behaviour.
This commit removes this usage of sprintf and uses strcat
to append strings to buf variable.

Signed-off-by: Francois Berder <fberder@outlook.fr>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
1 file changed