sched: split sched.h into separate header files

kernel/bsp.c

@@ -2,6 +2,8 @@
 #include <kernel/handle.h>
 #include <kernel/printk.h>
 #include <kernel/sched.h>
+#include <kernel/task.h>
+#include <kernel/thread.h>
 #include <kernel/util.h>
 #include <kernel/vm-object.h>
 #include <kernel/vm-region.h>

kernel/channel.c

@@ -1,6 +1,8 @@
 #include <kernel/channel.h>
 #include <kernel/msg.h>
 #include <kernel/port.h>
+#include <kernel/task.h>
+#include <kernel/thread.h>
 #include <kernel/util.h>
 #include <kernel/vm-region.h>
 

kernel/object.c

@@ -1,6 +1,8 @@
 #include <kernel/locks.h>
 #include <kernel/object.h>
 #include <kernel/queue.h>
+#include <kernel/sched.h>
+#include <kernel/thread.h>
 
 #define HAS_OP(obj, opname) ((obj)->ob_type->ob_ops.opname)
 

kernel/panic.c

@@ -2,7 +2,8 @@
 #include <kernel/libc/stdio.h>
 #include <kernel/machine/panic.h>
 #include <kernel/printk.h>
-#include <kernel/sched.h>
+#include <kernel/task.h>
+#include <kernel/thread.h>
 #include <stdarg.h>
 
 static int has_panicked = 0;

kernel/port.c

@@ -1,5 +1,6 @@
 #include <kernel/channel.h>
 #include <kernel/port.h>
+#include <kernel/thread.h>
 #include <kernel/util.h>
 
 #define PORT_CAST(p) OBJECT_C_CAST(struct port, p_base, &port_type, p)