Rename "user key" methods in vold

Rename methods that refer to "user key" to be more precise about what
they mean.  For more details, see the corresponding frameworks/base
changes (I202ebbfd2b4f79fedb3ed120a8ad81500c126894 and
I5894beb97823dced5954e405d779fada49c79e8d).

No change in behavior except for some changed log messages.

Flag: exempt, mechanical refactoring only
Test: presubmit
Change-Id: I9edcb557172395f4f6cf8e837efcc06fcfefb37d
diff --git a/binder/android/os/IVold.aidl b/binder/android/os/IVold.aidl
index 19e8e91..852e8af 100644
--- a/binder/android/os/IVold.aidl
+++ b/binder/android/os/IVold.aidl
@@ -85,14 +85,14 @@
 
     void setStorageBindingSeed(in byte[] seed);
 
-    void createUserKey(int userId, int userSerial, boolean ephemeral);
-    void destroyUserKey(int userId);
+    void createUserStorageKeys(int userId, int userSerial, boolean ephemeral);
+    void destroyUserStorageKeys(int userId);
 
-    void setUserKeyProtection(int userId, @utf8InCpp String secret);
+    void setCeStorageProtection(int userId, @utf8InCpp String secret);
 
     int[] getUnlockedUsers();
-    void unlockUserKey(int userId, int userSerial, @utf8InCpp String secret);
-    void lockUserKey(int userId);
+    void unlockCeStorage(int userId, int userSerial, @utf8InCpp String secret);
+    void lockCeStorage(int userId);
 
     void prepareUserStorage(@nullable @utf8InCpp String uuid, int userId, int userSerial,
                             int storageFlags);