SetupWizard: Don't show wifi setup on wifi-less devices

Altough uncommon, development boards and emulators don't have a wireless
interface. In those cases, don't show the wireless setup page.

Change-Id: I0017b2277defdccf7f0bd61cb9606254509f78cc

src/com/cyanogenmod/setupwizard/setup/CMSetupWizardData.java

@@ -51,7 +51,9 @@ public class CMSetupWizardData extends AbstractSetupData {
             pages.add(new BluetoothSetupPage(mContext, this));
         }
         pages.add(new WelcomePage(mContext, this));
-        pages.add(new WifiSetupPage(mContext, this));
+        if (SetupWizardUtils.hasWifi(mContext)) {
+            pages.add(new WifiSetupPage(mContext, this));
+        }
         if (SetupWizardUtils.hasTelephony(mContext)) {
             pages.add(new SimCardMissingPage(mContext, this)
                     .setHidden(isSimInserted()));

src/com/cyanogenmod/setupwizard/util/SetupWizardUtils.java

@@ -101,6 +101,11 @@ public class SetupWizardUtils {
         }
     }
 
+    public static boolean hasWifi(Context context) {
+        PackageManager packageManager = context.getPackageManager();
+        return packageManager.hasSystemFeature(PackageManager.FEATURE_WIFI);
+    }
+
     public static boolean hasTelephony(Context context) {
         PackageManager packageManager = context.getPackageManager();
         return packageManager.hasSystemFeature(PackageManager.FEATURE_TELEPHONY);