CVE-2026-23115 serial: Fix not set tty->port race condition

In the Linux kernel, the following vulnerability has been resolved: serial: Fix not set tty-port race condition Revert commit bfc467db60b7 "serial: remove redundant ttyportlinkdevice" because the ttyportlinkdevice is not redundant: the tty-port has to be confured before we call uartconfigureport,...