dt-bindings: pwm: ti,pwm-omap-dmtimer: Update binding for yaml

Update for yaml and remove the old txt binding.

As we can replace most of the custom timer API with standard Linux
frameworks such as clock framework, let's tag the properties for
ti,prescaler and ti,clock-source as deprecated.

Cc:  <[email protected]>
Cc: Nishanth Menon <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Uwe Kleine-König <[email protected]>
Cc: Vignesh Raghavendra <[email protected]>
Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Tony Lindgren <[email protected]>
Reviewed-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

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