drm/i915: don't include drm_cache.h in i915_drv.h

Include it only in files that use it.

Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/14edab4a193ea3f73f387a88e3836c8555401871.1644507885.git.jani.nikula@intel.com
diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index aea4c3064..5f6e416 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -25,6 +25,8 @@
  *
  */
 
+#include <drm/drm_cache.h>
+
 #include "gt/intel_engine.h"
 #include "gt/intel_engine_regs.h"
 #include "gt/intel_gpu_commands.h"