[ACPI] If BIOS disabled the LAPIC, believe it by default.

"lapic" is available to force enabling the LAPIC
in the event you know more than your BIOS vendor.
http://bugzilla.kernel.org/show_bug.cgi?id=3238

arch/i386/kernel/apic.c

@@ -691,6 +691,12 @@ static int __init detect_init_APIC (void)
 	}
 
 	if (!cpu_has_apic) {
+		/*
+		 * Over-ride BIOS and try to enable LAPIC
+		 * only if "lapic" specified
+		 */
+		if (enable_local_apic != 1)
+			goto no_apic;
 		/*
 		 * Some BIOSes disable the local APIC in the
 		 * APIC_BASE MSR. This can only be done in