fix IRQBALANCE Kconfig dependencies

CONFIG_IRQBALANCE only affects arch/i386/kernel/io_apic.c, so you should only see it as an option if you actually have one of those. This patch makes IRQBALANCE depend on X86_IO_APIC.

James

===== arch/i386/Kconfig 1.101 vs edited =====

@@ -828,7 +828,7 @@
 
 config IRQBALANCE
  	bool "Enable kernel irq balancing"
-	depends on SMP
+	depends on SMP && X86_IO_APIC
 	default y
 	help
  	  The defalut yes will allow the kernel to do irq load balancing.