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

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: 765f5124650a ("dt-bindings: arm: Drop the non-YAML bindings")
Fixes: 7996e402429d ("dt-bindings: arm: Add Integrator YAML schema")
Fixes: 357ea13f3b9f ("dt-bindings: arm: Add Versatile YAML schema")
Fixes: a5f410737909 ("dt-bindings: arm: Add RealView YAML schema")
Fixes: b70d22a62700 ("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.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>