drm/i915/display: add I915 conditional build to intel_lvds.h

Add stubs for !I915.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/f06a88a69b7e326ff0914baca5e6a0e5f06e1867.1694514689.git.jani.nikula@intel.com

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

@@ -13,10 +13,29 @@
 enum pipe;
 struct drm_i915_private;
 
+#ifdef I915
 bool intel_lvds_port_enabled(struct drm_i915_private *dev_priv,
 			     i915_reg_t lvds_reg, enum pipe *pipe);
 void intel_lvds_init(struct drm_i915_private *dev_priv);
 struct intel_encoder *intel_get_lvds_encoder(struct drm_i915_private *dev_priv);
 bool intel_is_dual_link_lvds(struct drm_i915_private *dev_priv);
+#else
+static inline bool intel_lvds_port_enabled(struct drm_i915_private *dev_priv,
+					   i915_reg_t lvds_reg, enum pipe *pipe)
+{
+	return false;
+}
+static inline void intel_lvds_init(struct drm_i915_private *dev_priv)
+{
+}
+static inline struct intel_encoder *intel_get_lvds_encoder(struct drm_i915_private *dev_priv)
+{
+	return NULL;
+}
+static inline bool intel_is_dual_link_lvds(struct drm_i915_private *dev_priv)
+{
+	return false;
+}
+#endif
 
 #endif /* __INTEL_LVDS_H__ */