Remove unused system properties

Properties ro.config.license_path and ro.config.manual_path are not set
from anywhere but only from a test.

Bug: N/A
Test: mma -j
Change-Id: I651405f3a201f5129bf37059e96e7bcc5efa73bf
(cherry picked from commit 31e37683f0e859d355d0bbb57500498cc0de3962)

tests/robotests/src/com/android/settings/SettingsLicenseActivityTest.java

@@ -25,7 +25,6 @@ import static org.mockito.Mockito.spy;
 import android.app.Application;
 import android.content.Intent;
 import android.net.Uri;
-import android.os.SystemProperties;
 
 import org.junit.Before;
 import org.junit.Test;
@@ -66,8 +65,6 @@ public class SettingsLicenseActivityTest {
 
     @Test
     public void testOnCreateWithValidHtmlFile() {
-        SystemProperties.set("ro.config.license_path", "/system/etc/NOTICE.html.gz");
-
         doReturn(true).when(mActivity).isFileValid(any());
         mActivity.onCreate(null);