Add Hotspot WPA3 Settings

- Add WPA3 SAE security types
  - "WPA3-Personal"
  - "WPA2/WPA3-Personal"

- Verify valid WPA3 password

- Enable QR code scanner for Hotspot WPA3

- Avoid null point exception when settings keyword searching

- Screenshot
  https://screenshot.googleplex.com/B6u54wh8w35Xnyf
  https://screenshot.googleplex.com/8hWHHUTb6UaS9vB

Bug: 167968488
Test: manual test
- atest WifiTetherSecurityPreferenceControllerTest
- atest WifiUtilsTest

Change-Id: I2992040498f8add107a4cce70a92c1c6ee6ab805

src/com/android/settings/wifi/tether/WifiTetherSettings.java

@@ -192,7 +192,7 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
     @Override
     public void onTetherConfigUpdated(AbstractPreferenceController context) {
         final SoftApConfiguration config = buildNewConfig();
-        mPasswordPreferenceController.updateVisibility(config.getSecurityType());
+        mPasswordPreferenceController.setSecurityType(config.getSecurityType());
 
         /**
          * if soft AP is stopped, bring up
@@ -216,10 +216,10 @@ public class WifiTetherSettings extends RestrictedDashboardFragment
         final SoftApConfiguration.Builder configBuilder = new SoftApConfiguration.Builder();
         final int securityType = mSecurityPreferenceController.getSecurityType();
         configBuilder.setSsid(mSSIDPreferenceController.getSSID());
-        if (securityType == SoftApConfiguration.SECURITY_TYPE_WPA2_PSK) {
+        if (securityType != SoftApConfiguration.SECURITY_TYPE_OPEN) {
             configBuilder.setPassphrase(
                     mPasswordPreferenceController.getPasswordValidated(securityType),
-                    SoftApConfiguration.SECURITY_TYPE_WPA2_PSK);
+                    securityType);
         }
         configBuilder.setBand(mApBandPreferenceController.getBandIndex());
         return configBuilder.build();