can: xilinx_can: Document driver description to list all supported IPs

Xilinx CAN driver supports AXI CAN, AXI CANFD, CANPS and CANFD PS IPs.
Document all supported IPs in comment description.

Signed-off-by: Harini T <harini.t@amd.com>
Link: https://lore.kernel.org/all/20240503060553.8520-3-harini.t@amd.com


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