Add java imports

Author: smowton

java/ql/lib/semmle/code/java/security/HardcodedCredentialsComparison.qll

@@ -2,6 +2,7 @@
  * Provides classes and predicates to detect comparing a parameter to a hard-coded credential.
  */
 
+import java
 import HardcodedCredentials
 
 /**

java/ql/lib/semmle/code/java/security/HardcodedPasswordField.qll

@@ -2,6 +2,7 @@
  * Provides a predicate identifying assignments of harcoded values to password fields.
  */
 
+import java
 import HardcodedCredentials
 
 /**