[IA64] support for cpu0 removal

here is the BSP removal support for IA64. Its pretty much the same thing that
was released a while back, but has your feedback incorporated.

- Removed CONFIG_BSP_REMOVE_WORKAROUND and associated cmdline param
- Fixed compile issue with sn2/zx1 due to a undefined fix_b0_for_bsp
- some formatting nits (whitespace etc)

This has been tested on tiger and long back by alex on hp systems as well.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

arch/ia64/kernel/irq.c

@@ -163,8 +163,19 @@ void fixup_irqs(void)
 {
 	unsigned int irq;
 	extern void ia64_process_pending_intr(void);
+	extern void ia64_disable_timer(void);
+	extern volatile int time_keeper_id;
+
+	ia64_disable_timer();
+
+	/*
+	 * Find a new timesync master
+	 */
+	if (smp_processor_id() == time_keeper_id) {
+		time_keeper_id = first_cpu(cpu_online_map);
+		printk ("CPU %d is now promoted to time-keeper master\n", time_keeper_id);
+	}
 
-	ia64_set_itv(1<<16);
 	/*
 	 * Phase 1: Locate irq's bound to this cpu and
 	 * relocate them for cpu removal.