drm/i915: rename GMBUS_PORT_* macros as GMBUS_PIN_*

The specs refer to pin pairs. Start moving towards using pin rather than
port all around to avoid confusion. No functional changes.

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index f5b7e1e..3e0e9b0 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -2294,7 +2294,7 @@
 	if (mapping->initialized && intel_gmbus_is_port_valid(mapping->i2c_pin))
 		pin = mapping->i2c_pin;
 	else
-		pin = GMBUS_PORT_DPB;
+		pin = GMBUS_PIN_DPB;
 
 	sdvo->i2c = intel_gmbus_get_adapter(dev_priv, pin);