dt-bindings: counter: add ti,am62-ecap-capture.yaml

This commit adds a YAML binding for TI ECAP used in capture operating mode.

Signed-off-by: Julien Panis <jpanis@baylibre.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20220923142437.271328-2-jpanis@baylibre.com/
Signed-off-by: William Breathitt Gray <william.gray@linaro.org>
Link: https://lore.kernel.org/r/33c27451f61b3a01d886da5e6bf6456088956439.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>