drm/i915: Unexport is_semiplanar_uv_plane()

This function is only used by intel_fb.c, so unexport it.

Cc: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211020195138.1841242-6-imre.deak@intel.com

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

@@ -349,7 +349,7 @@ bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane)
 	       plane == 2;
 }
 
-bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb, int color_plane)
+static bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb, int color_plane)
 {
 	return intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier) &&
 		color_plane == 1;

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

@@ -30,7 +30,6 @@ enum intel_plane_caps {
 bool is_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_plane(const struct drm_framebuffer *fb, int plane);
 bool is_gen12_ccs_cc_plane(const struct drm_framebuffer *fb, int plane);
-bool is_semiplanar_uv_plane(const struct drm_framebuffer *fb, int color_plane);
 
 u64 *intel_fb_plane_get_modifiers(struct drm_i915_private *i915,
 				  enum intel_plane_caps plane_caps);