dt-bindings: Remove last usage of "binding" or "schema" in titles

The Devicetree bindings document does not have to say in the title that
it is a "Devicetree binding", but instead just describe the hardware.

Most of these have been fixed already, so fix the handful that snuck in.
With this, a meta-schema check can be enabled to catch these
automatically.

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suman Anna <s-anna@ti.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Link: https://lore.kernel.org/r/20230615213154.1753313-1-robh@kernel.org


Signed-off-by: Rob Herring <robh@kernel.org>