vold: rename from "ext4 encryption" to fscrypt

We support file-based encryption on both ext4 and f2fs now, and the
kernel API is the same.  So rename things appropriately in vold:

    e4crypt => fscrypt
    ext4enc => fscrypt
    Ext4Crypt => FsCrypt
    EXT4_* => FS_*
    ext4_encryption_key => fscrypt_key

Additionally, the common functions shared by 'vold' and 'init' are now
in libfscrypt rather than ext4_utils.  So update vold to link to
libfscrypt and include the renamed headers.

Note: there's a chance of 'fscrypt' being confused with the dm-crypt
based encryption code in vold which is called 'cryptfs'.  However,
fscrypt is the name used in the kernel for ext4/f2fs/ubifs encryption,
and it's preferable to use the same name in userspace.

Test: built, booted device with f2fs encryption
Change-Id: I2a46a49f30d9c0b73d6f6fe09e4a4904d4138ff6
diff --git a/fs/F2fs.cpp b/fs/F2fs.cpp
index 9d72963..c6e0f52 100644
--- a/fs/F2fs.cpp
+++ b/fs/F2fs.cpp
@@ -20,7 +20,7 @@
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
-#include <ext4_utils/ext4_crypt.h>
+#include <fscrypt/fscrypt.h>
 
 #include <string>
 #include <vector>
@@ -81,7 +81,7 @@
         cmd.push_back("-O");
         cmd.push_back("quota");
     }
-    if (e4crypt_is_native()) {
+    if (fscrypt_is_native()) {
         cmd.push_back("-O");
         cmd.push_back("encrypt");
     }