Fix typo in Android Keystore KeyFactory exception message.

The typo was pointed out by kroot@ in code review of
4ecd092226 after it was submitted.

Bug: 18088752
Change-Id: I50d2fa93e1a2d352fe432e34ce98add82a71c483

keystore/java/android/security/keystore/AndroidKeyStoreKeyFactorySpi.java

@@ -113,7 +113,7 @@ public class AndroidKeyStoreKeyFactorySpi extends KeyFactorySpi {
                 return result;
             } else {
                 throw new InvalidKeySpecException(
-                        "Obtaining RSAPublicKeySpec not supported for " + key.getAlgorithm() + " "
+                        "Obtaining ECPublicKeySpec not supported for " + key.getAlgorithm() + " "
                         + ((key instanceof AndroidKeyStorePrivateKey) ? "private" : "public")
                         + " key");
             }