Make app installed cert flags persistent

Store AppInstalledRootCaCert and AppInstalledPrivateKey flags
in the config store to make them persistent. Resolves the issue
of certs that remain on the device after a connection is removed.
The reasone was that these flags were not persistent which caused
the logic to treat the certs as installed by the user.

Bug: 168871784
Test: Manually verify xml file contents
Test: atest XmlUtilTest
Change-Id: I06e93fa8688d1b483b68983d10b53fbe5acae32b

wifi/java/android/net/wifi/WifiEnterpriseConfig.java

@@ -1334,6 +1334,16 @@ public class WifiEnterpriseConfig implements Parcelable {
         return mIsAppInstalledDeviceKeyAndCert;
     }
 
+    /**
+     * Initialize the value of the app installed device key and cert flag.
+     *
+     * @param isAppInstalledDeviceKeyAndCert true or false
+     * @hide
+     */
+    public void initIsAppInstalledDeviceKeyAndCert(boolean isAppInstalledDeviceKeyAndCert) {
+        mIsAppInstalledDeviceKeyAndCert = isAppInstalledDeviceKeyAndCert;
+    }
+
     /**
      * Check if CA certificate was installed by an app, or manually (not by an app). If true,
      * CA certificate will be removed from key storage when this network is removed. If not,
@@ -1347,6 +1357,16 @@ public class WifiEnterpriseConfig implements Parcelable {
         return mIsAppInstalledCaCert;
     }
 
+    /**
+     * Initialize the value of the app installed root CA cert flag.
+     *
+     * @param isAppInstalledCaCert true or false
+     * @hide
+     */
+    public void initIsAppInstalledCaCert(boolean isAppInstalledCaCert) {
+        mIsAppInstalledCaCert = isAppInstalledCaCert;
+    }
+
     /**
      * Set the OCSP type.
      * @param ocsp is one of {@link ##OCSP_NONE}, {@link #OCSP_REQUEST_CERT_STATUS},