Consolidate intel vga int15 hooks

Change-Id: I9366dded98bf15f6da44ce893dd10698ba09fd55
Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com>
Reviewed-on: http://review.coreboot.org/6820
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
diff --git a/src/mainboard/apple/macbook21/Kconfig b/src/mainboard/apple/macbook21/Kconfig
index 871c16c..a01d6b16 100644
--- a/src/mainboard/apple/macbook21/Kconfig
+++ b/src/mainboard/apple/macbook21/Kconfig
@@ -13,6 +13,7 @@
 	select HAVE_MP_TABLE
 	select BOARD_ROMSIZE_KB_2048
 	select CHANNEL_XOR_RANDOMIZATION
+	select INTEL_INT15
 	select HAVE_ACPI_TABLES
 	select HAVE_ACPI_RESUME
 	select USE_OPTION_TABLE