Add magiskboot to kernelsu working directory (#1684)

Add the magiskboot binary to the /data/adb/ksu/bin directory so that
scripts/programs can call magiskboot to patch the boot/init_boot image.

---------

Co-authored-by: weishu <twsxtd@gmail.com>

userspace/ksud/src/cli.rs

@@ -35,7 +35,10 @@ enum Commands {
     BootCompleted,
 
     /// Install KernelSU userspace component to system
-    Install,
+    Install {
+        #[arg(long, default_value = None)]
+        magiskboot: Option<PathBuf>,
+    },
 
     /// Uninstall KernelSU modules and itself(LKM Only)
     Uninstall {
@@ -307,7 +310,7 @@ pub fn run() -> Result<()> {
                 Module::Shrink => module::shrink_ksu_images(),
             }
         }
-        Commands::Install => utils::install(),
+        Commands::Install { magiskboot } => utils::install(magiskboot),
         Commands::Uninstall { magiskboot } => utils::uninstall(magiskboot),
         Commands::Sepolicy { command } => match command {
             Sepolicy::Patch { sepolicy } => crate::sepolicy::live_patch(&sepolicy),