dt-bindings: can: fsl,flexcan: add transceiver capabilities

Currently the flexcan driver does only support adding PHYs by using the
"old" regulator bindings. Add support for CAN transceivers as a PHY.

Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Dimitri Fedrau <dimitri.fedrau@liebherr.com>
Link: https://patch.msgid.link/20250312-flexcan-add-transceiver-caps-v4-1-29e89ae0225a@liebherr.com


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