ARM: imx: move imx53-qsb audio codec clk lookup into DT

With device tree clk lookup support in place, we can move audio codec
clk lookup for ssi_ext1 into device tree now, so that imx53_qsb_init()
can be saved.

Since ssi_ext2 lookup is used nowhere, it gets removed together with
ssi_ext1 lookup from clk driver.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
diff --git a/arch/arm/boot/dts/imx53-qsb.dts b/arch/arm/boot/dts/imx53-qsb.dts
index 160d1bc..a885d37 100644
--- a/arch/arm/boot/dts/imx53-qsb.dts
+++ b/arch/arm/boot/dts/imx53-qsb.dts
@@ -147,6 +147,7 @@
 		reg = <0x0a>;
 		VDDA-supply = <&reg_3p2v>;
 		VDDIO-supply = <&reg_3p2v>;
+		clocks = <&clks 150>;
 	};
 };