send ACTION_KEYCHAIN_CHANGED in reset()

Reseting the keystore also changes the keychain.

Fixes: 36492171
Test: Clearing keystore in settings triggers an ACTION_KEYCHAIN_CHANGED
Change-Id: I7b1ab07f266fd2e13b2efc7b92d0f65660b8189b
diff --git a/src/com/android/keychain/KeyChainService.java b/src/com/android/keychain/KeyChainService.java
index 6351cd0..afdf272 100644
--- a/src/com/android/keychain/KeyChainService.java
+++ b/src/com/android/keychain/KeyChainService.java
@@ -241,6 +241,7 @@
                 }
             }
             broadcastTrustStoreChange();
+            broadcastKeychainChange();
             broadcastLegacyStorageChange();
             return ok;
         }