don't reinit aps when rebooting.  halting with interrupts off is good enough,
and we'd have to arrange to rehalt them if we reinit them.

Reference: /n/atom/patch/applied2013/fsnoinitap
Date: Sat Sep 14 21:03:42 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/fs/amd64/arch.c	Sat Sep 14 21:02:34 2013
+++ /sys/src/fs/amd64/arch.c	Sat Sep 14 21:02:36 2013
@@ -484,7 +484,6 @@
 void
 launchhalt(void)
 {
-	lapicinitaps();
 }
 
 void
--- /sys/src/fs/amd64/apic.h	Sat Sep 14 21:02:37 2013
+++ /sys/src/fs/amd64/apic.h	Sat Sep 14 21:02:39 2013
@@ -87,7 +87,6 @@
 void	lapicdump(void);
 int	lapiceoi(int);
 void	lapicinit(int, uintmem, int);
-void	lapicinitaps(void);
 void	lapicipi(int);
 int	lapicisr(int);
 Apic*	lapiclookup(uint);