dt-bindings: clock: si570: Add 'silabs,skip-recall' property

Add an optional property so the driver can skip calling the NVM->RAM
recall operation during probe().

Signed-off-by: Michal Simek <[e-mail]>
Signed-off-by: Saeed Nowshadi <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Acked-by: Rob Herring <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

Documentation/devicetree/bindings/clock/silabs,si570.txt

···
  - clock-frequency: Output frequency to generate. This defines the output
 		    frequency set during boot. It can be reprogrammed during
 		    runtime through the common clock framework.
+ - silabs,skip-recall: Do not perform NVM->RAM recall operation. It will rely
+		       on hardware loading of RAM from NVM at power on.
 
 Example:
 	si570: clock-generator@5d {