opt: Optimize the kpm && uid_scanner (#549)

* opt: Optimize the structure of kpm.rs

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

* opt: Optimize the uid_scanner startup logic in userspace && code style

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

* opt: rename kpm's ioctl

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

* opt: rename ksucalls::KsuKpmCmd's arg2..arg5

using
```rust
pub struct KsuKpmCmd {
    pub control_code: u64,
    pub arg1: u64,
    pub arg2: u64,
    pub result_code: u64,
}
```
This makes it easier to distinguish parameters.

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

---------

Signed-off-by: Tools-app <localhost.hutao@gmail.com>

userspace/ksud/src/ksucalls.rs

@@ -243,10 +243,10 @@ pub fn proxy_file(fd: RawFd) -> std::io::Result<RawFd> {
 #[derive(Clone, Copy, Default)]
 #[allow(dead_code)]
 pub struct KsuKpmCmd {
+    pub control_code: u64,
+    pub arg1: u64,
     pub arg2: u64,
-    pub arg3: u64,
-    pub arg4: u64,
-    pub arg5: u64,
+    pub result_code: u64,
 }
 
 #[allow(dead_code)]