drm/i915/sdvo: fix panel_type initialization

Commit 3f9ffce ("drm/i915: Do panel VBT init early if the VBT
declares an explicit panel type") started using -1 as the value for
unset panel_type. It gets initialized in intel_panel_init_alloc(), but
the SDVO code never calls it.

Call intel_panel_init_alloc() to initialize the panel, including the
panel_type.

Reported-by: Tomi Leppänen <[email protected]>
Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/8896
Fixes: 3f9ffce ("drm/i915: Do panel VBT init early if the VBT declares an explicit panel type")
Cc: Ville Syrjälä <[email protected]>
Cc: <[email protected]> # v6.1+
Reviewed-by: Uma Shankar <[email protected]>
Tested-by: Tomi Leppänen <[email protected]>
Signed-off-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 26e60294e8eacedc8ebb33405b2c375fd80e0900)
Signed-off-by: Rodrigo Vivi <[email protected]>

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

@@ -2752,7 +2752,7 @@ static struct intel_sdvo_connector *intel_sdvo_connector_alloc(void)
 	__drm_atomic_helper_connector_reset(&sdvo_connector->base.base,
 					    &conn_state->base.base);
 
-	INIT_LIST_HEAD(&sdvo_connector->base.panel.fixed_modes);
+	intel_panel_init_alloc(&sdvo_connector->base);
 
 	return sdvo_connector;
 }