ARM/dts: omap4-sdp: Disable unused McBSP3

McBSP3 is not usable on OMAP4 SDP/Blaze (the pins used for McPDM).
Signed-off-by: NPeter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: NTony Lindgren <tony@atomide.com>

arch/arm/boot/dts/omap4-sdp.dts

@@ -349,3 +349,7 @@
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart4_pins>;
 };
+
+&mcbsp3 {
+	status = "disabled";
+};