MAINTAINERS: dt: fix pointers for ARM Integrator, Versatile and RealView

There's a conversion from a plain text binding file into 4 yaml ones.
The old file got removed, causing this new warning:

	Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/arm/arm-boards

Address it by replacing the old reference by the new ones

Fixes: 2d483550 ("dt-bindings: arm: Drop the non-YAML bindings")
Fixes: 33fbfb3e ("dt-bindings: arm: Add Integrator YAML schema")
Fixes: 4b900070 ("dt-bindings: arm: Add Versatile YAML schema")
Fixes: 7db625b9 ("dt-bindings: arm: Add RealView YAML schema")
Fixes: 4fb00d90 ("dt-bindings: arm: Add Versatile Express and Juno YAML schema")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/eae3440fb70c1b1666973e34fd3fd6b8ab4a3bc7.1586881715.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

MAINTAINERS

@@ -1323,7 +1323,10 @@ ARM INTEGRATOR, VERSATILE AND REALVIEW SUPPORT
 M:	Linus Walleij <linus.walleij@linaro.org>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
-F:	Documentation/devicetree/bindings/arm/arm-boards
+F:	Documentation/devicetree/bindings/arm/arm,integrator.yaml
+F:	Documentation/devicetree/bindings/arm/arm,realview.yaml
+F:	Documentation/devicetree/bindings/arm/arm,versatile.yaml
+F:	Documentation/devicetree/bindings/arm/arm,vexpress-juno.yaml
 F:	Documentation/devicetree/bindings/auxdisplay/arm-charlcd.txt
 F:	Documentation/devicetree/bindings/clock/arm,syscon-icst.yaml
 F:	Documentation/devicetree/bindings/i2c/i2c-versatile.txt