drm/vmwgfx: Fix query buffer locking order violation

The query buffers were reserved while holding the binding mutex, which
caused a circular locking dependency.

Cc: stable@vger.kernel.org
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Brian Paul <brianp@vmware.com>

diff --cc drivers/gpu/drm/vmwgfx/vmwgfx_context.c
Simple merge