Revert "Remove Activity Recognition from the Android Code."

This reverts commit e24f1b095b020382f555c7f34f22ff3fb5005f90.

Reason for revert: b/123172409

Change-Id: Ic5863a8e8b36c8c4d8636cc4c004ad9606a3f523
diff --git a/config/hiddenapi-greylist.txt b/config/hiddenapi-greylist.txt
index 3a4d904..fc47f67 100644
--- a/config/hiddenapi-greylist.txt
+++ b/config/hiddenapi-greylist.txt
@@ -462,6 +462,8 @@
 Landroid/hardware/input/IInputManager$Stub;->asInterface(Landroid/os/IBinder;)Landroid/hardware/input/IInputManager;
 Landroid/hardware/input/IInputManager$Stub;->TRANSACTION_injectInputEvent:I
 Landroid/hardware/input/IInputManager;->injectInputEvent(Landroid/view/InputEvent;I)Z
+Landroid/hardware/location/IActivityRecognitionHardwareClient$Stub;-><init>()V
+Landroid/hardware/location/IActivityRecognitionHardwareClient;->onAvailabilityChanged(ZLandroid/hardware/location/IActivityRecognitionHardware;)V
 Landroid/hardware/location/IContextHubService$Stub;->asInterface(Landroid/os/IBinder;)Landroid/hardware/location/IContextHubService;
 Landroid/hardware/usb/IUsbManager$Stub$Proxy;-><init>(Landroid/os/IBinder;)V
 Landroid/hardware/usb/IUsbManager$Stub;->asInterface(Landroid/os/IBinder;)Landroid/hardware/usb/IUsbManager;