serial: 8250: remove the redundant include

The serial_core.h file have been included in header file
serial_8250.h. so remove the "#include <serial_core.h>" in
some 8250 serial drivers, because they have included the header file
serial_8250.h.

Signed-off-by: Wang Long <long.wanglong@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/tty/serial/8250/8250_core.c
Simple merge

diff --cc drivers/tty/serial/8250/8250_dw.c
Simple merge

diff --cc drivers/tty/serial/8250/8250_early.c
Simple merge

diff --cc drivers/tty/serial/8250/8250_em.c
Simple merge

diff --cc drivers/tty/serial/8250/8250_hp300.c
Simple merge

diff --cc drivers/tty/serial/8250/8250_omap.c
Simple merge