drm/i915/connector: make intel_connector_init() static
intel_connector_init() is only used in intel_connector.c. Make it
static.
Reviewed-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Link: https://lore.kernel.org/r/46443c16f9cbff039cd3c830871289ab17110905.1753787803.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>