Remove fixed USAGE_HW_TEXTURE flag from BufferQueue.

USAGE_HW_TEXTURE applies to SurfaceTexture, not to all uses of
BufferQueue. Refactor accordingly.

Change-Id: Ic7add5e1f2bbec3d3e796ba7f15eaa0633945d8f
diff --git a/libs/gui/SurfaceTexture.cpp b/libs/gui/SurfaceTexture.cpp
index a6ee971..a6e8dbf 100644
--- a/libs/gui/SurfaceTexture.cpp
+++ b/libs/gui/SurfaceTexture.cpp
@@ -150,6 +150,7 @@
                 strerror(-err), err);
     } else {
         mBufferQueue->setConsumerName(mName);
+        mBufferQueue->setConsumerUsageBits(DEFAULT_USAGE_FLAGS);
     }
 }
 
@@ -720,6 +721,7 @@
 
 status_t SurfaceTexture::setConsumerUsageBits(uint32_t usage) {
     Mutex::Autolock lock(mMutex);
+    usage |= DEFAULT_USAGE_FLAGS;
     return mBufferQueue->setConsumerUsageBits(usage);
 }