Kernel: Do not open stdio fds for kernel processes

Kernel processes just do not need them.

This also avoids touching the file (sub)system early in the boot process when
initializing the colonel process.

Kernel/Process.cpp

@@ -1283,7 +1283,7 @@ Process::Process(Thread*& first_thread, const String& name, uid_t uid, gid_t gid
 #endif
             m_fds[i] = fork_parent->m_fds[i];
         }
-    } else {
+    } else if (ring == Ring3) {
         m_fds.resize(m_max_open_file_descriptors);
         auto& device_to_use_as_tty = tty ? (CharacterDevice&)*tty : NullDevice::the();
         m_fds[0].set(*device_to_use_as_tty.open(O_RDONLY).value());