Include linux/sched.h to fix below build error.

    CC      drivers/rtc/rtc-imxdi.o
  drivers/rtc/rtc-imxdi.c: In function 'di_write_wait':
  drivers/rtc/rtc-imxdi.c:168: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)
  drivers/rtc/rtc-imxdi.c:168: error: (Each undeclared identifier is reported only once
  drivers/rtc/rtc-imxdi.c:168: error: for each function it appears in.)
  drivers/rtc/rtc-imxdi.c:168: error: implicit declaration of function 'signal_pending'
  drivers/rtc/rtc-imxdi.c:168: error: implicit declaration of function 'schedule_timeout'
  drivers/rtc/rtc-imxdi.c: In function 'dryice_norm_irq':
  drivers/rtc/rtc-imxdi.c:329: error: 'TASK_INTERRUPTIBLE' undeclared (first use in this function)
Signed-off-by: NAxel Lin <axel.lin@gmail.com>
Cc: Baruch Siach <baruch@tkos.co.il>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

This driver is based on code from Freescale which accompanies their i.MX25
PDK board, with some cleanup.
Signed-off-by: NBaruch Siach <baruch@tkos.co.il>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Sascha Hauer <kernel@pengutronix.de>
Acked-by: NWan ZongShun <mcuos.com@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>