drm/i915/display: fix spelling mistake "Couldnt" -> "Couldn't"

There is a spelling mistake in a drm_dbg message. Fix it.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210203110803.17894-1-colin.king@canonical.com

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

@@ -2650,7 +2650,7 @@ void intel_dp_check_frl_training(struct intel_dp *intel_dp)
 	if (intel_dp_pcon_start_frl_training(intel_dp) < 0) {
 		int ret, mode;
 
-		drm_dbg(&dev_priv->drm, "Couldnt set FRL mode, continuing with TMDS mode\n");
+		drm_dbg(&dev_priv->drm, "Couldn't set FRL mode, continuing with TMDS mode\n");
 		ret = drm_dp_pcon_reset_frl_config(&intel_dp->aux);
 		mode = drm_dp_pcon_hdmi_link_mode(&intel_dp->aux, NULL);