igt/kms_flip: Calibrate timestamp errors

We assert that the interval between a vblank and a flip corresponds with
the computed frametime derived from the modeline. However, historically
the dotclock is unreliable (in error of about 1%) for VBT supplied data
about LVDS panels - the situation looks to be much improved with eDP at
least. The simple fact that we cannot rely on the manufacturer's supplied
modeline causes us to fail the test. So before we claim a driver failure,
do a calibration pass and check for inconsistencies with the modeline.

v2: Refine the failure message when skipping

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

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