Kernel: Allow fchmod() and fchown() on pre-bind() local sockets

In order to ensure a specific owner and mode when the local socket
filesystem endpoint is instantiated, we need to be able to call
fchmod() and fchown() on a socket fd between socket() and bind().

This is because until we call bind(), there is no filesystem inode
for the socket yet.

Kernel/FileSystem/InodeFile.cpp

@@ -52,3 +52,13 @@ KResult InodeFile::truncate(off_t size)
 {
     return m_inode->truncate(size);
 }
+
+KResult InodeFile::chown(uid_t uid, gid_t gid)
+{
+    return VFS::the().chown(*m_inode, uid, gid);
+}
+
+KResult InodeFile::chmod(mode_t mode)
+{
+    return VFS::the().chmod(*m_inode, mode);
+}