serial/asm9260_serial.c: use lock insight of console

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
serial/asm9260_serial.c: use ioread/iowrite

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
drivers/tty/serial/asm9260_serial.c

Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>