Remove unnecessary SELinux dependencies

These are unused.

Test: code compiles.
Change-Id: Idd707dfcc8f6daac3a489c791ecc364841cf31f9

debuggerd/Android.bp

@@ -275,7 +275,6 @@ cc_binary {
         "libdebuggerd_client",
         "liblog",
         "libprocinfo",
-        "libselinux",
     ],
 
     local_include_dirs: ["include"],

debuggerd/debuggerd.cpp

@@ -28,7 +28,6 @@
 #include <android-base/unique_fd.h>
 #include <debuggerd/client.h>
 #include <procinfo/process.h>
-#include <selinux/selinux.h>
 #include "util.h"
 
 using android::base::unique_fd;

init/reboot.cpp

@@ -20,7 +20,6 @@
 #include <fcntl.h>
 #include <linux/fs.h>
 #include <mntent.h>
-#include <selinux/selinux.h>
 #include <sys/capability.h>
 #include <sys/cdefs.h>
 #include <sys/ioctl.h>