virgl_hw: add allocator-specific bind flags
VIRGL_BIND_SHARED allows external allocators to intercept resource creation. Reserve the upper byte of bind flags to allow passing allocator-specific flags, and define a set of such flags for minigbm.
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VIRGL_BIND_SHARED allows external allocators to intercept resource creation. Reserve the upper byte of bind flags to allow passing allocator-specific flags, and define a set of such flags for minigbm.