drm/amd/display: Remove unneeded semicolon in hdcp.c

Fixes coccicheck warning:

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c:506:2-3: Unneeded semicolon
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp.c

@@ -503,7 +503,7 @@ enum mod_hdcp_operation_mode mod_hdcp_signal_type_to_operation_mode(
 		break;
 	default:
 		break;
-	};
+	}
 
 	return mode;
 }