Intel Lynx Point: Use 2 << 24 to clarify that I/O APIC ID is 2

Commit »haswell: Add initial support for Haswell platforms« (76c3700f)
[1] used `1 << 25` to set the I/O APIC ID of 2. Instead using
`2 << 24`, which is the same value, makes it clear, that the
I/O APIC ID is 2.

Commit »Intel Panther Point PCH: Use 2 << 24 to clarify that APIC ID
is 2« (8c937c7e) [2] is used as a template.

[1] http://review.coreboot.org/2616
[2] http://review.coreboot.org/3100

Change-Id: I28f9e90856157b4fdd9a1e781472cc4f51d25ece
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/3123
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/southbridge/intel/lynxpoint/lpc.c

@@ -56,7 +56,7 @@ static void pch_enable_apic(struct device *dev)
 	pci_write_config8(dev, ACPI_CNTL, 0x80);
 
 	*ioapic_index = 0;
-	*ioapic_data = (1 << 25);
+	*ioapic_data = (2 << 24);
 
 	/* affirm full set of redirection table entries ("write once") */
 	*ioapic_index = 1;