Check if device is online before starting 16kb test

Test: atest -c Enable16KbTest
Bug: 390535191
Change-Id: I32cc404f8e84fba0e90ecb5b801d98908242292d

tests/Enable16KbTests/src/com/android/test/Enable16KbTest.java

@@ -51,7 +51,12 @@ public class Enable16KbTest extends BaseHostJUnit4Test {
     @Test
     @AppModeFull
     public void enable16KbToggle() throws Exception {
-        assertTrue(isPackageInstalled(APP_PACKAGE));
+        // Wait for 2 mins device to be online
+        getDevice().waitForDeviceOnline(120000);
+        if (!isPackageInstalled(APP_PACKAGE)) {
+            //If test app has failed for some reason, retry installation
+            installTestApp();
+        }
 
         // Check if developer option is enabled otherwise exit
         getDevice().enableAdbRoot();