headers: remove sched.h from interrupt.h

After m68k's task_thread_info() doesn't refer to current,
it's possible to remove sched.h from interrupt.h and not break m68k!
Many thanks to Heiko Carstens for allowing this.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

drivers/mtd/devices/m25p80.c

@@ -21,6 +21,7 @@
 #include <linux/interrupt.h>
 #include <linux/mutex.h>
 #include <linux/math64.h>
+#include <linux/sched.h>
 
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>