ds1302: remove unneeded linux/miscdevice.h include

drivers/char/ds1302.c does not use any miscdevice so the
inclusion of linux/miscdevice.h is unnecessary.
This patch remove this inclusion.

Signed-off-by: Corentin Labbe <clabbe.montjoie@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>