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/IGraphicBufferConsumer.h b/include/gui/IGraphicBufferConsumer.h
index b0d4c76..9f0e9aa 100644
--- a/include/gui/IGraphicBufferConsumer.h
+++ b/include/gui/IGraphicBufferConsumer.h
@@ -230,7 +230,7 @@
     //
     // Return of a value other than NO_ERROR means an error has occurred:
     // * NO_INIT - the buffer queue has been abandoned.
-    virtual status_t getReleasedBuffers(uint32_t* slotMask) = 0;
+    virtual status_t getReleasedBuffers(uint64_t* slotMask) = 0;
 
     // setDefaultBufferSize is used to set the size of buffers returned by
     // dequeueBuffer when a width and height of zero is requested.  Default