docs: dt: maintainer: Add Devicetree and OF maintainer profile document

Document how Devicetree and Open Firmware maintainers handle their
subsystem, especially focusing on two caveats:

Devicetree subsystem handles patches with a minor difference comparing
to other subsystems: while DT maintainers pick up OF code, they only
provide review of DT bindings without applying these.

All three DT bindings maintainers rely currently on Patchwork and due to
enormous amount of emails per day, regardless how much DT maintainers
try, they cannot read all the emails.

Cc: Rob Herring <robh@kernel.org>
Cc: Conor Dooley <conor+dt@kernel.org>
Cc: Saravana Kannan <saravanak@kernel.org>
Cc: devicetree@vger.kernel.org
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260721060916.12465-2-krzysztof.kozlowski@oss.qualcomm.com
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>

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