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-rumi.dts b/arch/arm/boot/dts/msm8974-rumi.dts
index 1706327..3533151 100644
--- a/arch/arm/boot/dts/msm8974-rumi.dts
+++ b/arch/arm/boot/dts/msm8974-rumi.dts
@@ -23,8 +23,8 @@
 		clock-frequency = <5000000>;
 	};
 
-	serial@f991f000 {
-		status = "disable";
+	serial@f995e000 {
+		status = "ok";
 	};
 
 	usb@f9a55000 {