tests: drivers: can: timing: do not test additional sample points

Remove tests for additional sample points as this does not provide any real
value.

The purpose of this test suite is to see if the selected CAN clock allows
meeting the standard bitrates and sample points used by Zephyr. Any
tweaking needed for a specific board or system design is left up to the
user and not something that can be covered by testing a few additional
sample point locations.

Change a few comments and remove an unneeded conditional while here.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
1 file changed