drm/i915/display: add I915 conditional build to intel_pch_refclk.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/4359b34cbcff6199b5e42b5311c815aa6f4a167c.1694514689.git.jani.nikula@intel.com

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

@@ -11,6 +11,7 @@
 struct drm_i915_private;
 struct intel_crtc_state;
 
+#ifdef I915
 void lpt_program_iclkip(const struct intel_crtc_state *crtc_state);
 void lpt_disable_iclkip(struct drm_i915_private *dev_priv);
 int lpt_get_iclkip(struct drm_i915_private *dev_priv);
@@ -18,5 +19,27 @@ int lpt_iclkip(const struct intel_crtc_state *crtc_state);
 
 void intel_init_pch_refclk(struct drm_i915_private *dev_priv);
 void lpt_disable_clkout_dp(struct drm_i915_private *dev_priv);
+#else
+static inline void lpt_program_iclkip(const struct intel_crtc_state *crtc_state)
+{
+}
+static inline void lpt_disable_iclkip(struct drm_i915_private *dev_priv)
+{
+}
+static inline int lpt_get_iclkip(struct drm_i915_private *dev_priv)
+{
+	return 0;
+}
+static inline int lpt_iclkip(const struct intel_crtc_state *crtc_state)
+{
+	return 0;
+}
+static inline void intel_init_pch_refclk(struct drm_i915_private *dev_priv)
+{
+}
+static inline void lpt_disable_clkout_dp(struct drm_i915_private *dev_priv)
+{
+}
+#endif
 
 #endif