drivers/intel/gma: Unify VBT related Kconfig names

Shuffle words and drop the _DATA_FILE suffix.

Change-Id: I0b0d50ea729e5580c0bc7b43f250ff387ce59cfc
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/26898
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/mainboard/asus/p5gc-mx/Kconfig b/src/mainboard/asus/p5gc-mx/Kconfig
index 68ac58e..04a9b8b 100644
--- a/src/mainboard/asus/p5gc-mx/Kconfig
+++ b/src/mainboard/asus/p5gc-mx/Kconfig
@@ -31,7 +31,7 @@
 	select BOARD_ROMSIZE_KB_512
 	select CHANNEL_XOR_RANDOMIZATION
 	select MAINBOARD_HAS_NATIVE_VGA_INIT
-	select INTEL_GMA_VBT_HAVE_DATA_FILE
+	select INTEL_GMA_HAVE_VBT
 
 config MAINBOARD_DIR
 	string