uboot-phytec

video: ipu: avoid overflow issue

Multiplication, as "clk->parent->rate * 16" may overflow. So use
do_div to avoid such issue.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Signed-off-by: Sandor Yu <sandor.yu@nxp.com>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>