MAINTAINERS: rectify entry for XILINX CAN DRIVER

Commit 7843d3c ("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: 7843d3c ("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>

MAINTAINERS

@@ -21632,7 +21632,7 @@ M:	Appana Durga Kedareswara rao <appana.durga.rao@xilinx.com>
 R:	Naga Sureshkumar Relli <naga.sureshkumar.relli@xilinx.com>
 L:	linux-can@vger.kernel.org
 S:	Maintained
-F:	Documentation/devicetree/bindings/net/can/xilinx_can.txt
+F:	Documentation/devicetree/bindings/net/can/xilinx,can.yaml
 F:	drivers/net/can/xilinx_can.c
 
 XILINX GPIO DRIVER