drm/i915/display: let intel_plane_uses_fence be used from other places.

I want to refactor some stuff using this so make it shared.
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211012043502.1377715-3-airlied@gmail.com

drivers/gpu/drm/i915/display/intel_display.c

@@ -851,7 +851,7 @@ unsigned int intel_remapped_info_size(const struct intel_remapped_info *rem_info
 	return size;
 }
 
-static bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
+bool intel_plane_uses_fence(const struct intel_plane_state *plane_state)
 {
 	struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
 	struct drm_i915_private *dev_priv = to_i915(plane->base.dev);

drivers/gpu/drm/i915/display/intel_display.h

@@ -615,6 +615,7 @@ void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state);
 int bdw_get_pipemisc_bpp(struct intel_crtc *crtc);
 unsigned int intel_plane_fence_y_offset(const struct intel_plane_state *plane_state);
 
+bool intel_plane_uses_fence(const struct intel_plane_state *plane_state);
 bool
 intel_format_info_is_yuv_semiplanar(const struct drm_format_info *info,
 				    u64 modifier);