staging: ion: Remove left over comment

Commit 2bb9f503 ("gpu: ion: Remove heapmask from client")
removed the heap_type_mask parameter. Remove the associated
kernel-doc comment too.
Signed-off-by: Sachin Kamat <sachin.kamat@samsung.com>
Cc: Rebecca Schultz Zavin <rebecca@android.com>
Cc: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/android/ion/ion.h

@@ -84,7 +84,6 @@ void ion_reserve(struct ion_platform_data *data);
 /**
  * ion_client_create() -  allocate a client and returns it
  * @dev:		the global ion device
- * @heap_type_mask:	mask of heaps this client can allocate from
  * @name:		used for debugging
  */
 struct ion_client *ion_client_create(struct ion_device *dev,