devicetree: bindings: Remove deprecated properties

The deprecated DT properties are part of the GIT history,
no need to keep them around any longer.

Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>