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/net/wan/cosa.c

@@ -76,6 +76,7 @@
 
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/sched.h>
 #include <linux/slab.h>
 #include <linux/poll.h>
 #include <linux/fs.h>

drivers/net/wan/cycx_x25.c

@@ -84,6 +84,7 @@
 #include <linux/kernel.h>	/* printk(), and other useful stuff */
 #include <linux/module.h>
 #include <linux/string.h>	/* inline memset(), etc. */
+#include <linux/sched.h>
 #include <linux/slab.h>		/* kmalloc(), kfree() */
 #include <linux/stddef.h>	/* offsetof(), etc. */
 #include <linux/wanrouter.h>	/* WAN router definitions */

drivers/net/wan/dscc4.c

@@ -81,6 +81,7 @@
  */
 
 #include <linux/module.h>
+#include <linux/sched.h>
 #include <linux/types.h>
 #include <linux/errno.h>
 #include <linux/list.h>

drivers/net/wan/farsync.c

@@ -19,6 +19,7 @@
 #include <linux/kernel.h>
 #include <linux/version.h>
 #include <linux/pci.h>
+#include <linux/sched.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/if.h>