device: drop i915 specific headers from resource allocator includes

src/include/device/ is the place for include files of the resource
allocator. Hence, drop the i915 include file copies and use the ones
supplied with the i915 driver instead. The only remaining user of this
was the Intel Whitetip Mountain 2 reference board, all other occurences
have been previously fixed already.

Change-Id: Ib9f72df4e8f847597508971e9dbf671f49019767
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: http://review.coreboot.org/8140
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/intel/wtm2/intel_dp.c b/src/mainboard/intel/wtm2/intel_dp.c
index e7222a3..b389946 100644
--- a/src/mainboard/intel/wtm2/intel_dp.c
+++ b/src/mainboard/intel/wtm2/intel_dp.c
@@ -30,7 +30,7 @@
 #include <console/console.h>
 #include <stdint.h>
 #include <delay.h>
-#include <device/i915.h>
+#include <drivers/intel/gma/i915.h>
 
 u32
 pack_aux(u32 *src32, int src_bytes)