intel_extreme: use VESA EDID info as fallback.

* Only in case retrieving EDID info failed on head A and C.
* Should help with detecting the native resolution for ticket #10878.

headers/private/graphics/intel_extreme/intel_extreme.h

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2009, Haiku, Inc. All Rights Reserved.
+ * Copyright 2006-2014, Haiku, Inc. All Rights Reserved.
  * Distributed under the terms of the MIT License.
  *
  * Authors:
@@ -15,6 +15,8 @@
 #include <Drivers.h>
 #include <PCI.h>
 
+#include <edid.h>
+
 
 #define VENDOR_ID_INTEL			0x8086
 
@@ -201,6 +203,9 @@ struct intel_shared_info {
 	DeviceType		device_type;
 	char			device_identifier[32];
 	struct pll_info	pll_info;
+
+	edid1_info		vesa_edid_info;
+	bool			has_vesa_edid_info;
 };
 
 //----------------- ioctl() interface ----------------