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.
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.