drm/i915: s/haswell_update_wm/ilk_update_wm/

We use this hook starting from ILK onwards, so change the prefix
accordingly. Also rename functions/struct names used from
haswell_update_wm that are relevant to ILK already.

No functional change.
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/i915_drv.h

@@ -1215,7 +1215,7 @@ struct intel_wm_level {
 	uint32_t fbc_val;
 };
 
-struct hsw_wm_values {
+struct ilk_wm_values {
 	uint32_t wm_pipe[3];
 	uint32_t wm_lp[3];
 	uint32_t wm_lp_spr[3];
@@ -1521,7 +1521,7 @@ typedef struct drm_i915_private {
 		uint16_t cur_latency[5];
 
 		/* current hardware state */
-		struct hsw_wm_values hw;
+		struct ilk_wm_values hw;
 	} wm;
 
 	struct i915_package_c8 pc8;