Revert "serial: 8250: Revert "drop lockdep annotation from serial8250_clear_IER()""

This reverts commit 422c972.

kernel test robot has found problems with this commit so revert it for
now.

Link: https://lore.kernel.org/r/[email protected]
Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/oe-lkp/[email protected]
Cc: John Ogness <[email protected]>
Cc: Petr Mladek <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: gregkh

drivers/tty/serial/8250/8250_port.c

@@ -726,9 +726,6 @@ static void __serial8250_clear_IER(struct uart_8250_port *up)
 
 static inline void serial8250_clear_IER(struct uart_8250_port *up)
 {
-	/* Port locked to synchronize UART_IER access against the console */
-	lockdep_assert_held_once(&up->port.lock);
-
 	__serial8250_clear_IER(up);
 }