MAINTAINERS: pps: Update pps-gpio bindings location

The pps-gpio bindings have been converted to yaml.

Update the file path accordingly.

Fixes: 7ceb60e ("dt-bindings: pps: pps-gpio: Convert to yaml")
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202308230517.n0rrszYH-lkp@intel.com/
Signed-off-by: Fabio Estevam <festevam@denx.de>
Acked-by: Rodolfo Giometti <giometti@enneenne.com>
Link: https://lore.kernel.org/r/20230822213317.60798-1-festevam@gmail.com
Signed-off-by: Rob Herring <robh@kernel.org>

Author: Fabio Estevam

MAINTAINERS

@@ -17021,7 +17021,7 @@ L:	linuxpps@ml.enneenne.com (subscribers-only)
 S:	Maintained
 W:	http://wiki.enneenne.com/index.php/LinuxPPS_support
 F:	Documentation/ABI/testing/sysfs-pps
-F:	Documentation/devicetree/bindings/pps/pps-gpio.txt
+F:	Documentation/devicetree/bindings/pps/pps-gpio.yaml
 F:	Documentation/driver-api/pps.rst
 F:	drivers/pps/
 F:	include/linux/pps*.h