ARM: dts: omap: Drop references to opp.txt

opp.txt is getting removed with the OPP binding converted to DT schema.
As it is unusual to reference a binding doc from a dts file, let's just
remove the reference.

Cc: "Benoît Cousson" <[email protected]>
Cc: Tony Lindgren <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: Viresh Kumar <[email protected]>

Author: robherring

arch/arm/boot/dts/omap34xx.dtsi

@@ -24,7 +24,6 @@
 		};
 	};
 
-	/* see Documentation/devicetree/bindings/opp/opp.txt */
 	cpu0_opp_table: opp-table {
 		compatible = "operating-points-v2-ti-cpu";
 		syscon = <&scm_conf>;

arch/arm/boot/dts/omap36xx.dtsi

@@ -29,7 +29,6 @@
 		};
 	};
 
-	/* see Documentation/devicetree/bindings/opp/opp.txt */
 	cpu0_opp_table: opp-table {
 		compatible = "operating-points-v2-ti-cpu";
 		syscon = <&scm_conf>;