system: vold: Use wrapped key for metadata encryption

Wrapped key feature is needed for better security of encryption keys and to
ensure data integrity when crypto key cache is cleared during reset operation
of storage/crypto hardware.

Original patch: https://source.codeaurora.org/quic/la/platform/system/vold/commit/?h=LA.QSSI.11.0.r1-05600-qssi.0&id=c480f913e6abc2757c0d79afba5a3df1c4adc731
[Pig]: Clean up all deprecated codes that were removed during latter
merge.

CRs-Fixed: 2367150
Change-Id: I83d14861bf81e102151fa3417d84008c214a9ac0

FsCrypt.cpp

@@ -289,6 +289,10 @@ static bool get_volume_file_encryption_options(EncryptionOptions* options) {
     return true;
 }
 
+bool is_metadata_wrapped_key_supported() {
+    return GetEntryForMountPoint(&fstab_default, METADATA_MNT_POINT)->fs_mgr_flags.wrapped_key;
+}
+
 static bool read_and_install_user_ce_key(userid_t user_id,
                                          const android::vold::KeyAuthentication& auth) {
     if (s_ce_policies.count(user_id) != 0) return true;

FsCrypt.h

@@ -37,3 +37,4 @@ bool fscrypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
 bool fscrypt_destroy_user_storage(const std::string& volume_uuid, userid_t user_id, int flags);
 
 bool fscrypt_destroy_volume_keys(const std::string& volume_uuid);
+bool is_metadata_wrapped_key_supported();

VoldUtil.h

@@ -21,3 +21,4 @@
 extern android::fs_mgr::Fstab fstab_default;
 
 #define DATA_MNT_POINT "/data"
+#define METADATA_MNT_POINT "/metadata"