Schematize Telephony System Properties

Properties accessed across partitions are now schematized and will
become APIs to make explicit interfaces among partitions.

Bug: 117924132
Bug: 141246285
Test: lunch blueline-userdebug; m checkbuild
Change-Id: Ic4f16a4475eb2870dcaeec41b38de90a0f6473bb
diff --git a/src/com/android/settings/AirplaneModeEnabler.java b/src/com/android/settings/AirplaneModeEnabler.java
index dde7ce0..cdb9793 100644
--- a/src/com/android/settings/AirplaneModeEnabler.java
+++ b/src/com/android/settings/AirplaneModeEnabler.java
@@ -23,12 +23,11 @@
 import android.os.Handler;
 import android.os.Looper;
 import android.os.Message;
-import android.os.SystemProperties;
 import android.os.UserHandle;
 import android.provider.Settings;
+import android.sysprop.TelephonyProperties;
 
 import com.android.internal.telephony.PhoneStateIntentReceiver;
-import com.android.internal.telephony.TelephonyProperties;
 import com.android.settingslib.WirelessUtils;
 import com.android.settingslib.core.instrumentation.MetricsFeatureProvider;
 
@@ -125,8 +124,7 @@
     }
 
     public void setAirplaneMode(boolean isAirplaneModeOn) {
-        if (Boolean.parseBoolean(
-                SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE))) {
+        if (TelephonyProperties.in_ecm_mode().orElse(false)) {
             // In ECM mode, do not update database at this point
         } else {
             mMetricsFeatureProvider.action(mContext, SettingsEnums.ACTION_AIRPLANE_TOGGLE,