kernel: expose umount list to ioctl interface (#2950)

This idea is borrowed from simonpunk's susfs4ksu.
What we see here is that, yeah well, lets just have userspace send us
what it
wants unmounted, this is better than hardcoding everything.

This also solves that issue where MNT_DETACH fails, as long as we send
unmountables in proper order.

A small anti-duplicate mechanism is also added.

While in-kernel umount is a bit worse than zygisk-provider-based ones,
this can still
serve as a healthy alternative.

---------

- Remove duplicate checks

Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
Co-authored-by: weishu <twsxtd@gmail.com>
Co-authored-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>

manager/app/src/main/res/values-zh-rHK/strings.xml

@@ -124,7 +124,6 @@
     <string name="selected_lkm">選擇嘅 LKM：%s</string>
     <string name="save_log">存儲日誌</string>
     <string name="log_saved">日誌已存儲</string>
-    <string name="sus_su_mode">SuS SU 模式：</string>
     <!-- Module related -->
     <string name="module_install_confirm">確認安裝模組 %1$s？</string>
     <string name="unknown_module">未知模組</string>
@@ -276,8 +275,6 @@
     <string name="advanced_settings">高級配置</string>
     <string name="appearance_settings">外觀配置</string>
     <string name="back">返回</string>
-    <string name="susfs_enabled">SuSFS 已啟用</string>
-    <string name="susfs_disabled">SuSFS 已禁用</string>
     <string name="background_set_success">背景設定成功</string>
     <string name="background_removed">已移除自定義背景</string>
     <string name="icon_switch_title">備選圖標</string>
@@ -576,7 +573,6 @@
     <string name="home_zygisk_implement">Zygisk 實現</string>
     <!-- 循环路径相关 -->
     <!-- 循环路径功能描述 -->
-    <string name="sus_loop_path_feature_label">SuS 循環路徑</string>
     <string name="sus_loop_paths_description_title">循環路徑配置</string>
     <string name="sus_loop_paths_description_text">循環路徑會喺每次非 root 用戶應用程式或者隔離服務啟動時，重新標記做 SUS_PATH。咁樣可以解決因為 inode 狀態重設或者核心重新建立 inode 而令到添加嘅路徑失效嘅問題。</string>
     <string name="avc_log_spoofing">AVC 日誌欺騙</string>