arm/dt: msm8974: Disable simulation UARTs by default

Disable the simulation UARTs in the top-level DTSI file and
explicitly enable them in the simulation DTS files to avoid
the maintenance burden of disabling them on all new
targets.

Change-Id: Ifc85b131c13abbf13ebe6066388e2c64efea0a51
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
diff --git a/arch/arm/boot/dts/msm8974.dtsi b/arch/arm/boot/dts/msm8974.dtsi
index 1c8b8c4..e3dad4f 100644
--- a/arch/arm/boot/dts/msm8974.dtsi
+++ b/arch/arm/boot/dts/msm8974.dtsi
@@ -63,12 +63,14 @@
 		compatible = "qcom,msm-lsuart-v14";
 		reg = <0xf991f000 0x1000>;
 		interrupts = <0 109 0>;
+		status = "disabled";
 	};
 
 	serial@f995e000 {
 		compatible = "qcom,msm-lsuart-v14";
 		reg = <0xf995e000 0x1000>;
 		interrupts = <0 114 0>;
+		status = "disabled";
 	};
 
 	usb@f9a55000 {