bindings: ti,mspm0-counter: remove clock-frequency

no longer need as we are parsing leveraging the clocks property to
fetch the clock (sysclock)

Signed-off-by: Dimitris Karnikis <[email protected]>

Author: dkarnikis

dts/bindings/counter/ti,mspm0-counter.yaml

@@ -25,6 +25,3 @@ properties:
   resolution:
     type: int
     required: true
-  clock-frequency:
-    type: int
-    required: true