arm64: zynqmp: Enable iio-hwmon description only for SOM

Description is coming from SOM only that's why enable it only on SOM.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/08ee4ce2fe242905dd99cea2b87373b57d8fea91.1736152939.git.michal.simek@amd.com
diff --git a/arch/arm/dts/zynqmp-sm-k26-revA.dts b/arch/arm/dts/zynqmp-sm-k26-revA.dts
index b514dc2..70acd3e 100644
--- a/arch/arm/dts/zynqmp-sm-k26-revA.dts
+++ b/arch/arm/dts/zynqmp-sm-k26-revA.dts
@@ -97,6 +97,10 @@
 	};
 };
 
+&ams {
+	status = "okay";
+};
+
 &modepin_gpio {
 	label = "modepin";
 };