MAINTAINERS: rectify entry for XILINX GPIO DRIVER

Commit ba96b2e ("dt-bindings: gpio: gpio-xilinx: Convert Xilinx axi
gpio binding to YAML") converts gpio-xilinx.txt to xlnx,gpio-xilinx.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 GPIO DRIVER.

Signed-off-by: Lukas Bulwahn <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>

Author: bulwahn

MAINTAINERS

@@ -22301,7 +22301,7 @@ M:	Shubhrajyoti Datta <[email protected]>
 R:	Srinivas Neeli <[email protected]>
 R:	Michal Simek <[email protected]>
 S:	Maintained
-F:	Documentation/devicetree/bindings/gpio/gpio-xilinx.txt
+F:	Documentation/devicetree/bindings/gpio/xlnx,gpio-xilinx.yaml
 F:	Documentation/devicetree/bindings/gpio/gpio-zynq.yaml
 F:	drivers/gpio/gpio-xilinx.c
 F:	drivers/gpio/gpio-zynq.c