drm/i915: move dsi init functions to intel_dsi.h

Keep the header self-contained. It'll need rework of its own in the
future, but gotta start somewhere.
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/158347ef715a35ca1f7d945efb139d80bf5e0e6c.1556540889.git.jani.nikula@intel.com

drivers/gpu/drm/i915/Makefile.header-test

@@ -24,6 +24,7 @@ header_test := \
 	intel_dp.h \
 	intel_dpll_mgr.h \
 	intel_drv.h \
+	intel_dsi.h \
 	intel_dvo.h \
 	intel_dvo_dev.h \
 	intel_fbc.h \

drivers/gpu/drm/i915/intel_drv.h

@@ -1832,11 +1832,6 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector);
 /* intel_dp_mst.c */
 int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_id);
 void intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port);
-/* vlv_dsi.c */
-void vlv_dsi_init(struct drm_i915_private *dev_priv);
-
-/* icl_dsi.c */
-void icl_dsi_init(struct drm_i915_private *dev_priv);
 
 /* intel_dsi_dcs_backlight.c */
 int intel_dsi_dcs_init_backlight_funcs(struct intel_connector *intel_connector);

drivers/gpu/drm/i915/intel_dsi.h

@@ -151,6 +151,9 @@ static inline u16 intel_dsi_encoder_ports(struct intel_encoder *encoder)
 	return enc_to_intel_dsi(&encoder->base)->ports;
 }
 
+/* icl_dsi.c */
+void icl_dsi_init(struct drm_i915_private *dev_priv);
+
 /* intel_dsi.c */
 int intel_dsi_bitrate(const struct intel_dsi *intel_dsi);
 int intel_dsi_tlpx_ns(const struct intel_dsi *intel_dsi);
@@ -166,6 +169,7 @@ enum drm_mode_status intel_dsi_mode_valid(struct drm_connector *connector,
 struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
 					   const struct mipi_dsi_host_ops *funcs,
 					   enum port port);
+void vlv_dsi_init(struct drm_i915_private *dev_priv);
 
 /* vlv_dsi_pll.c */
 int vlv_dsi_pll_compute(struct intel_encoder *encoder,