ARM: dts: Configure power-domain for omap4 dts iss

Configure power-domain for omap4 dts iss in preparation to
probing devices with simple-pm-bus and genpd.

Signed-off-by: Tony Lindgren <[e-mail]>

arch/arm/boot/dts/omap4.dtsi

···
 					<SYSC_IDLE_SMART>,
 					<SYSC_IDLE_SMART_WKUP>;
 			ti,sysc-delay-us = <2>;
+			power-domains = <&prm_cam>;
 			clocks = <&iss_clkctrl OMAP4_ISS_CLKCTRL 0>;
 			clock-names = "fck";
 			#address-cells = <1>;