dt-bindings: watchdog: qcom-wdt: merge MSM timer

dt-bindings: watchdog: qcom-wdt: merge MSM timer

Merge Qualcomm MSM timer bindings into watchdog, because the timer
compatibles are already included here and the hardware is quite similar.

While converting the MSM timer bindings, adjust clock-frequency
property to take only one frequency, instead of two, because:
1. DT schema does not allow to frequencies,
2. The Linux timer driver reads only first frequency.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20221212163532.142533-6-krzysztof.kozlowski@linaro.org
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>