Revert "vc4_hdmi: Adjust CEC ref clock based on its input clock"

commit  9056a3603e68326ee0c6a9c6c4d389029b6aae5c from
https://github.com/raspberrypi/linux.git

 rpi-5.10.y

This reverts commit 7269a05437b3157a842f57bcb665a0801225702b.
Signed-off-by: Meng Li <Meng.Li@windriver.com>