Nest some more namespaces

Did someone previously suggest that all namespace had been
nested?  Silly.

Signed-off-by: Stephan Pleines <pleines.stephan@gmail.com>
Change-Id: I22278c1caaeba8b47dc46fb2ed3078c20a11e190
diff --git a/y2022/vision/gpio.h b/y2022/vision/gpio.h
index 6ed7328..d7b44d4 100644
--- a/y2022/vision/gpio.h
+++ b/y2022/vision/gpio.h
@@ -14,8 +14,7 @@
 
 #include "aos/init.h"
 
-namespace y2022 {
-namespace vision {
+namespace y2022::vision {
 
 using namespace frc971::vision;
 
@@ -353,6 +352,5 @@
   aos::TimerHandler *const pwm_timer_;
 };
 
-}  // namespace vision
-}  // namespace y2022
+}  // namespace y2022::vision
 #endif  // Y2022_VISION_GPIO_H_