Remove __INTRODUCED_IN from a typedef

__INTRODUCED_IN only applies to function or variable declarations, not
a typedef to a function pointer.

Bug: android/ndk#706
Test: builds
Change-Id: I472565d3e34e5c6a3cd88500ad03ef9ce4489c25
Exempt-From-Owner-Approval: cherrypick
(cherry picked from commit e0ec2e3)

camera/ndk/include/camera/NdkCameraManager.h

@@ -119,7 +119,7 @@ void ACameraManager_deleteCameraIdList(ACameraIdList* cameraIdList) __INTRODUCED
  *                 this callback returns.
  */
 typedef void (*ACameraManager_AvailabilityCallback)(void* context,
-        const char* cameraId) __INTRODUCED_IN(24);
+        const char* cameraId);
 
 /**
  * A listener for camera devices becoming available or unavailable to open.