drm/i915/lrc: replace include with forward declarations

Prefer forward declarations over includes if possible.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220214173810.2108975-2-jani.nikula@intel.com

drivers/gpu/drm/i915/gt/intel_lrc.c

@@ -8,6 +8,8 @@
 #include "gen8_engine_cs.h"
 #include "i915_drv.h"
 #include "i915_perf.h"
+#include "i915_reg.h"
+#include "intel_context.h"
 #include "intel_engine.h"
 #include "intel_engine_regs.h"
 #include "intel_gpu_commands.h"

drivers/gpu/drm/i915/gt/intel_lrc.h

@@ -8,11 +8,12 @@
 
 #include <linux/types.h>
 
-#include "intel_context.h"
-
 struct drm_i915_gem_object;
+struct i915_gem_ww_ctx;
+struct intel_context;
 struct intel_engine_cs;
 struct intel_ring;
+struct kref;
 
 /* At the start of the context image is its per-process HWS page */
 #define LRC_PPHWSP_PN	(0)