FUI: reorganize include files

We've got enough of a handle on this to realize some things:
drm_dp_helper.h is by design device and architecture independent
i915.h is common to most intel graphics chipsets going back several years
i915_reg.h is as well

Move these files to src/include/device, and adjust the .c files accordingly.

Change-Id: I07512b3695fea0b22949074b467986420783d62a
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3637
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/include/edid.h b/src/include/edid.h
index 8809cce..7d4736d 100644
--- a/src/include/edid.h
+++ b/src/include/edid.h
@@ -66,5 +66,6 @@
 
 /* Defined in src/lib/edid.c */
 int decode_edid(unsigned char *edid, int size, struct edid *out);
+void set_vbe_mode_info_valid(struct edid *edid, uintptr_t fb_addr);
 
 #endif /* EDID_H */