MAINTAINERS: rectify entry for XILINX CAN DRIVER

Commit 7843d3c8 ("dt-bindings: can: xilinx_can: Convert Xilinx CAN
binding to YAML") converts xilinx_can.txt to xilinx,can.yaml, but
missed to adjust its reference in MAINTAINERS.

Hence, ./scripts/get_maintainer.pl --self-test=patterns complains
about a broken reference.

Repair this file reference in XILINX CAN DRIVER.

Fixes: 7843d3c8 ("dt-bindings: can: xilinx_can: Convert Xilinx CAN binding to YAML")
Link: https://lore.kernel.org/all/20220321122840.17841-1-lukas.bulwahn@gmail.com


Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>