kernel: Do not depend on OVERLAY_FS

We are using 5ec1cff's Magic Mount now!

Overlayfs have some compatibility issue in a few device, so using this feature "maybe" unnecessary.

And i'll try to improve Magic Mount API.

kernel: Allow KPROBES hooks optional on GKI

Some apps will detect that KernelSU uses kprobes and think that the device
environment is abnormal. Therefore, to avoid being detected, it is best to
follow the official documentation of KernelSU to manually hook, just like
doing it on a traditional kernel.

This commit allows us to manually hook while keeping CONFIG_KPROBES enabled.

Notes:
The kernel having kprobes support does not mean that the environment is
abnormal, because GKI has kprobes support by default, and disabling kprobes
support will make it impossible to start the device.

Co-authored-by: Pzqqt <821026875@qq.com>
Signed-off-by: rsuntk <rissu.ntk@gmail.com>

ksud: Address warning: elided lifetime has a name

warning: elided lifetime has a name
   --> src/sepolicy.rs:170:41
    |
169 | impl<'a> SeObjectParser<'a> for NormalPerm<'a> {
    |      -- lifetime 'a declared here
170 |     fn parse(input: &'a str) -> IResult<&str, Self> {
    |                                         ^ this elided lifetime gets resolved as 'a
    |
    = note: #[warn(elided_named_lifetimes)] on by default

warning: ksud (bin "ksud") generated 1 warning
    Finished release profile [optimized] target(s) in 46.61s

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

kernel: bring back get_ksu_state()

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

Don't unshare after entering global namespace (#2373)

Global namespace is usually used to publicly apply mounts so calling
unshare after entering root namespace is not desired bahavior. This also
keeps -M option same as Magisk.

ksud: Fix warning unused import (#2382)

docs: Refine docs

ksud: Update busybox

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

kernel: throne_tracker: Fix missing quotes

How i can forgot these?

kernel: clear securebits

fix adb shell cannot escape to root after https://github.com/tiann/KernelSU/pull/2381

ksud: Bring back /sbin as TEMP_DIR_LEGACY

In this commit https://github.com/tiann/KernelSU/commit/fd09ccfc2906ad119f7158f9518810e06a73a919 TEMP_DIR_LEGACY was removed, so i restore it back.

We only use /debug_ramdisk and /sbin because of this https://github.com/tiann/KernelSU/commit/71cb86c2e9a9e1e9c323cf06dd287e8a69616904#commitcomment-143172576

Cherry-picks from:
- https://github.com/bmax121/APatch/blob/main/apd/src/utils.rs
- https://github.com/bmax121/APatch/blob/main/apd/src/m_mount.rs

Notice: You may will experiencing some issue with module, please backup your modules before update to this manager

Signed-off-by: rsuntk <rissu.ntk@gmail.com>

kernel: add try_umount /system_ext and fmt

Follow KernelSU upstreams.

Signed-off-by: rsuntk <rissu.ntk@gmail.com>