Restore getSimStateForSlotIndex in SubscriptionManager

MTK IMS still needs it here

Change-Id: I41bac57c68055f369232359a464642daab94403b
Signed-off-by: Nishant Kumar <www.rajsonu13@gmail.com>
Signed-off-by: Hưng Phan <phandinhhungvp2001@gmail.com>

telephony/java/android/telephony/SubscriptionManager.java

@@ -2549,6 +2549,20 @@ public boolean isNetworkRoaming(int subId) {
         return TelephonyManager.getDefault().isNetworkRoaming(subId);
     }
 
+    /**
+     * Returns a constant indicating the state of sim for the slot index.
+     *
+     * @param slotIndex Logical SIM slot index.
+     *
+     * @see TelephonyManager.SimState
+     *
+     * @hide
+     */
+    @TelephonyManager.SimState
+    public static int getSimStateForSlotIndex(int slotIndex) {
+        return TelephonyManager.getSimStateForSlotIndex(slotIndex);
+    }
+
     /**
      * Set a field in the subscription database. Note not all fields are supported.
      *