dtoverlays: Reduce the link-frequencies of IMX519

commit  6c3b57443d789954253065e704ff6241f1d00d61 from
https://github.com/raspberrypi/linux.git

 rpi-6.1.y

Modify the link-frequencies of IMX519 to 408000000.

Signed-off-by: Lee Jackson <lee.jackson@arducam.com>
Signed-off-by: Meng Li <Meng.Li@windriver.com>