Add PROPERTY_IMS_REG_REQUIRED.

Bug: 5337311
Change-Id: Ic5f310f485b49b29385bc1427a1f156484896569

Author: Wink Saville

telephony/java/com/android/internal/telephony/TelephonyProperties.java

@@ -182,4 +182,9 @@ public interface TelephonyProperties
      * in commercial configuration.
      */
     static final String PROPERTY_TEST_CSIM = "persist.radio.test-csim";
+
+    /**
+     * Set to true to indicate a test ims registration required.
+     */
+    static final String PROPERTY_IMS_REG_REQUIRED = "persist.radio.imsregrequired";
 }