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kernel: remove relics of CPU 'load balancing' policy in scheduler (thanks Robert Ransom)

This code was deleted from Plan 9 before the 9front repo began.
Proc.movetime was used by it, but has never been referenced in 9front.

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -755,7 +755,6 @@

 	ulong	lastupdate;

 	uchar	yield;		/* non-zero if the process just did a sleep(0) */

 	ulong	readytime;	/* time process came ready */

-	ulong	movetime;	/* last time process switched processors */

 	int	preempted;	/* true if this process hasn't finished the interrupt

 				 *  that last preempted it

 				 */

--- a/sys/src/9/port/proc.c

+++ b/sys/src/9/port/proc.c

@@ -525,8 +525,7 @@

 loop:

 	/*

 	 *  find a process that last ran on this processor (affinity),

-	 *  or one that hasn't moved in a while (load balancing).  Every

-	 *  time around the loop affinity goes down.

+	 *  or one that can be moved to this processor.

 	 */

 	spllo();

 	for(i = 0;; i++){