Convert all in-tree NXP FlexCAN instances from hardcoding the CAN bus
timing in time quanta to specifying a desired sample point of 87.5% as
recommended by CAN in Automation (CiA).
This allows for the CAN driver to calculate the optimal time quanta
based on the CAN clock and the requested CAN bitrate.
Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>