BufferQueue: Increase max slots from 32 to 64

Increases NUM_BUFFER_SLOTS from 32 to 64 and changes the mask
returned by IGBC::getReleasedBuffers from 32 to 64 bits.

Bug: 13174352
Change-Id: Ie8ef0853916cfb91f83881c7241886bb1950f01a
diff --git a/include/gui/BufferQueueConsumer.h b/include/gui/BufferQueueConsumer.h
index 7f24c83..1912ed0 100644
--- a/include/gui/BufferQueueConsumer.h
+++ b/include/gui/BufferQueueConsumer.h
@@ -93,7 +93,7 @@
     // but have not yet been released by the consumer.
     //
     // This should be called from the onBuffersReleased() callback.
-    virtual status_t getReleasedBuffers(uint32_t* outSlotMask);
+    virtual status_t getReleasedBuffers(uint64_t* outSlotMask);
 
     // setDefaultBufferSize is used to set the size of buffers returned by
     // dequeueBuffer when a width and height of zero is requested.  Default