Prevent PIN/Passwword disappearing during boot

During startup, when the telephony service starts, a configChange is sent
to the CryptKeeper activity, causing it to lose its data.

Ignore this change since it is immaterial to what we display.

Bug: 17421115

Change-Id: I83f867f3de5d90ff1050e3906da142d99fd6c276
diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 11665b0..0fb6228 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1670,7 +1670,7 @@
                   android:launchMode="singleTop"
                   android:excludeFromRecents="true"
                   android:theme="@style/Theme.CryptKeeper"
-                  android:configChanges="keyboard|keyboardHidden|uiMode"
+                  android:configChanges="mnc|mcc|keyboard|keyboardHidden|uiMode"
                   android:windowSoftInputMode="adjustResize"
                   android:screenOrientation="nosensor">
             <intent-filter android:priority="10">