Remove secdiscard IPC call

No longer used by the framework, hence removing.

Bug: 62140539
Test: builds
Change-Id: I17b9818ea6121d84223a502949186cf679a83a90

Ext4Crypt.cpp

@@ -835,7 +835,3 @@ bool e4crypt_destroy_volume_keys(const std::string& volume_uuid) {
     res &= destroy_volume_keys("/data/misc_de", volume_uuid);
     return res;
 }
-
-bool e4crypt_secdiscard(const std::string& path) {
-    return android::vold::runSecdiscardSingle(path);
-}

Ext4Crypt.h

@@ -36,5 +36,3 @@ bool e4crypt_prepare_user_storage(const std::string& volume_uuid, userid_t user_
 bool e4crypt_destroy_user_storage(const std::string& volume_uuid, userid_t user_id, int flags);
 
 bool e4crypt_destroy_volume_keys(const std::string& volume_uuid);
-
-bool e4crypt_secdiscard(const std::string& path);

VoldNativeService.cpp

@@ -759,13 +759,5 @@ binder::Status VoldNativeService::destroyUserStorage(const std::unique_ptr<std::
     return translateBool(e4crypt_destroy_user_storage(uuid_, userId, flags));
 }
 
-binder::Status VoldNativeService::secdiscard(const std::string& path) {
-    ENFORCE_UID(AID_SYSTEM);
-    CHECK_ARGUMENT_PATH(path);
-    ACQUIRE_CRYPT_LOCK;
-
-    return translateBool(e4crypt_secdiscard(path));
-}
-
 }  // namespace vold
 }  // namespace android

VoldNativeService.h

@@ -113,8 +113,6 @@ public:
             int32_t userId, int32_t userSerial, int32_t flags);
     binder::Status destroyUserStorage(const std::unique_ptr<std::string>& uuid,
             int32_t userId, int32_t flags);
-
-    binder::Status secdiscard(const std::string& path);
 };
 
 }  // namespace vold

binder/android/os/IVold.aidl

@@ -93,8 +93,6 @@ interface IVold {
     void prepareUserStorage(@nullable @utf8InCpp String uuid, int userId, int userSerial, int storageFlags);
     void destroyUserStorage(@nullable @utf8InCpp String uuid, int userId, int storageFlags);
 
-    void secdiscard(@utf8InCpp String path);
-
     const int ENCRYPTION_FLAG_NO_UI = 4;
 
     const int ENCRYPTION_STATE_NONE = 1;