drm/i915: Make intel_{enable,disable}_sagv() static

intel_{enable,disable}_sagv() are no longer needed outside the
compilation unit. Make them static.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200925121749.708-1-ville.syrjala@linux.intel.comReviewed-by: José Roberto de Souza <jose.souza@intel.com>

drivers/gpu/drm/i915/intel_pm.c

@@ -3706,7 +3706,7 @@ skl_setup_sagv_block_time(struct drm_i915_private *dev_priv)
  *  - All planes can enable watermarks for latencies >= SAGV engine block time
  *  - We're not using an interlaced display configuration
  */
-int
+static int
 intel_enable_sagv(struct drm_i915_private *dev_priv)
 {
 	int ret;
@@ -3740,7 +3740,7 @@ intel_enable_sagv(struct drm_i915_private *dev_priv)
 	return 0;
 }
 
-int
+static int
 intel_disable_sagv(struct drm_i915_private *dev_priv)
 {
 	int ret;

drivers/gpu/drm/i915/intel_pm.h

@@ -49,8 +49,6 @@ void g4x_wm_sanitize(struct drm_i915_private *dev_priv);
 void vlv_wm_sanitize(struct drm_i915_private *dev_priv);
 bool intel_can_enable_sagv(struct drm_i915_private *dev_priv,
 			   const struct intel_bw_state *bw_state);
-int intel_enable_sagv(struct drm_i915_private *dev_priv);
-int intel_disable_sagv(struct drm_i915_private *dev_priv);
 void intel_sagv_pre_plane_update(struct intel_atomic_state *state);
 void intel_sagv_post_plane_update(struct intel_atomic_state *state);
 bool skl_wm_level_equals(const struct skl_wm_level *l1,