ARM: dts: omap5-clocks.dtsi: add ti, set-rate-parent to dss_dss_clk

Add ti,set-rate-parent to dss_dss_clk so that the DSS driver can
set the rate.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NTero Kristo <t-kristo@ti.com>

arch/arm/boot/dts/omap54xx-clocks.dtsi

@@ -804,6 +804,7 @@
 		clocks = <&dpll_per_h12x2_ck>;
 		ti,bit-shift = <8>;
 		reg = <0x1420>;
+		ti,set-rate-parent;
 	};
 
 	dss_sys_clk: dss_sys_clk {