clk: exynos5433: Add documentation for the audio block parent clocks

Audio block requires access to two parent clocks: audio PLL and oscillator,
so add this information to device tree bindings documentation.

Signed-off-by: Marek Szyprowski <[e-mail]>
Reviewed-by: Chanwoo Choi <[e-mail]>
Signed-off-by: Sylwester Nawrocki <[e-mail]>

Documentation/devicetree/bindings/clock/exynos5433-clock.txt

···
 		- sclk_decon_tv_vclk_disp
 		- aclk_disp_333
 
+	Input clocks for audio clock controller:
+		- oscclk
+		- fout_aud_pll
+
 	Input clocks for bus0 clock controller:
 		- aclk_bus0_400
 
···
 		compatible = "samsung,exynos5433-cmu-aud";
 		reg = <0x114c0000 0x0b04>;
 		#clock-cells = <1>;
+
+		clock-names = "oscclk", "fout_aud_pll";
+		clocks = <&xxti>, <&cmu_top CLK_FOUT_AUD_PLL>;
 	};
 
 	cmu_bus0: clock-controller@13600000 {