SMP - CPU local run queues

- each CPU has its own runqueues

- processes on BSP are put on the runqueues later after a switch to
  the final stack when cpuid works to avoid special cases

- enqueue() and dequeue() use the run queues of the cpu the process is
  assigned to

- pick_proc() uses the local run queues

- printing of per-CPU run queues ('2') on serial console

kernel/proc.h

@@ -252,8 +252,6 @@ struct proc {
 #ifndef __ASSEMBLY__
 
 EXTERN struct proc proc[NR_TASKS + NR_PROCS];	/* process table */
-EXTERN struct proc *rdy_head[NR_SCHED_QUEUES]; /* ptrs to ready list headers */
-EXTERN struct proc *rdy_tail[NR_SCHED_QUEUES]; /* ptrs to ready list tails */
 
 _PROTOTYPE( int mini_send, (struct proc *caller_ptr, endpoint_t dst_e,
 		message *m_ptr, int flags));