Expose ACTION_EMERGENCY_ASSISTANCE as SystemAPi

It's used by DefaultPermissionGrantPolicy.

Bug: 146091614
Test: make
Change-Id: I907736c7d6745660279a505761e27dfbbd1ddc97
diff --git a/api/system-current.txt b/api/system-current.txt
index ebfd55e..f7f6544 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -8933,6 +8933,7 @@
     method public void updateServiceLocation();
     method @RequiresPermission(android.Manifest.permission.READ_ACTIVE_EMERGENCY_SESSION) public void updateTestOtaEmergencyNumberDbFilePath(@NonNull String);
     field @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public static final String ACTION_ANOMALY_REPORTED = "android.telephony.action.ANOMALY_REPORTED";
+    field public static final String ACTION_EMERGENCY_ASSISTANCE = "android.telephony.action.EMERGENCY_ASSISTANCE";
     field public static final String ACTION_SIM_APPLICATION_STATE_CHANGED = "android.telephony.action.SIM_APPLICATION_STATE_CHANGED";
     field public static final String ACTION_SIM_CARD_STATE_CHANGED = "android.telephony.action.SIM_CARD_STATE_CHANGED";
     field public static final String ACTION_SIM_SLOT_STATUS_CHANGED = "android.telephony.action.SIM_SLOT_STATUS_CHANGED";
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 4fb26fd..ecaf21cd 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -592,6 +592,7 @@
      *
      * @hide
      */
+    @SystemApi
     @SdkConstant(SdkConstantType.ACTIVITY_INTENT_ACTION)
     public static final String ACTION_EMERGENCY_ASSISTANCE =
             "android.telephony.action.EMERGENCY_ASSISTANCE";