drm: move i915_gsc_proxy_mei_interface.h under include/drm/intel

Clean up the top level include/drm directory by grouping all the Intel
specific files under a common subdirectory.

Cc: Daniel Vetter <[e-mail]>
Cc: Dave Airlie <[e-mail]>
Cc: Lucas De Marchi <[e-mail]>
Cc: Tomas Winkler <[e-mail]>
Reviewed-by: Andi Shyti <[e-mail]>
Acked-by: Lucas De Marchi <[e-mail]>
Acked-by: Rodrigo Vivi <[e-mail]>
Signed-off-by: Jani Nikula <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/461[e-mail]

drivers/gpu/drm/i915/gt/uc/intel_gsc_proxy.c

···
 #include <linux/component.h>
 
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_print.h"

drivers/gpu/drm/xe/xe_gsc_proxy.c

···
 
 #include <drm/drm_managed.h>
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 #include "abi/gsc_proxy_commands_abi.h"
 #include "regs/xe_gsc_regs.h"

drivers/misc/mei/gsc_proxy/mei_gsc_proxy.c

···
 #include <linux/uuid.h>
 #include <drm/drm_connector.h>
 #include <drm/i915_component.h>
-#include <drm/i915_gsc_proxy_mei_interface.h>
+#include <drm/intel/i915_gsc_proxy_mei_interface.h>
 
 /**
  * mei_gsc_proxy_send - Sends a proxy message to ME FW.