MAINTAINERS: Update path for U-Boot environment variables YAML

This file was moved to the layouts/ subdirectory.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20240902142952.71639-6-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Rafał Miłecki

MAINTAINERS

@@ -23457,7 +23457,7 @@ F:	drivers/media/pci/tw686x/
 U-BOOT ENVIRONMENT VARIABLES
 M:	Rafał Miłecki <rafal@milecki.pl>
 S:	Maintained
-F:	Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+F:	Documentation/devicetree/bindings/nvmem/layouts/u-boot,env.yaml
 F:	drivers/nvmem/layouts/u-boot-env.c
 F:	drivers/nvmem/u-boot-env.c