dt-bindings: can: flexcan: list supported processors

The compatible is a pattern match. Explicitly list all possible values.
Also mention that the ls1028ar1 must be followed by lx2160ar1.

Signed-off-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20201001091131.30514-2-michael@walle.cc


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>