[wpilibc, wpiutil] Clean up includes (NFC) (#3426)

wpilibc/src/main/native/include/frc/AddressableLED.h

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <memory>
+#include <initializer_list>
 
 #include <hal/AddressableLEDTypes.h>
 #include <hal/Types.h>

wpilibc/src/main/native/include/frc/AsynchronousInterrupt.h

@@ -12,6 +12,8 @@
 #include <thread>
 #include <utility>
 
+#include <units/time.h>
+
 namespace frc {
 /**
  * Class for handling asynchronous interrupts.

wpilibc/src/main/native/include/frc/DriverStation.h

@@ -4,6 +4,8 @@
 
 #pragma once
 
+#include <stdint.h>
+
 #include <array>
 #include <atomic>
 #include <memory>