kernel, ksud, manager: New supercalls implementations

* This commit squashes new supercall impl:
3138651a38..562a3b9be7

Thanks to these people below:

Official KernelSU:
Co-authored-by: Wang Han <416810799@qq.com>
Co-authored-by: weishu <twsxtd@gmail.com>
Co-authored-by: Ylarod <me@ylarod.cn>
Co-authored-by: YuKongA <70465933+YuKongA@users.noreply.github.com>

xxKSU maintainer:
Co-authored-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
MMRL maintainer:
Co-authored-by: Der_Googler <54764558+dergoogler@users.noreply.github.com>
KSUN maintainer:
Co-authored-by: Rifat Azad <33044977+rifsxd@users.noreply.github.com>
KOWSU maintainer:
Co-authored-by: KOWX712 <leecc0503@gmail.com>

kernel/ksu.h

@@ -58,13 +58,6 @@ struct dynamic_manager_user_config {
 	char hash[65];
 };
 
-struct manager_list_info {
-	int count;
-	struct {
-		uid_t uid;
-		int signature_index;
-	} managers[2];
-};
 
 struct root_profile {
 	int32_t uid;