dt-bindings: omap: Partially convert omap.txt to yaml

Convert omap.txt to yaml.

CC: linux-omap@vger.kernel.org
Signed-off-by: Andrew Davis <afd@ti.com>
[reduced to only OMAP3/4/5 and AM3, adding Epson Moverio BT-200]
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Message-ID: <20230515074512.66226-2-andreas@kemnade.info>
Signed-off-by: Tony Lindgren <tony@atomide.com>