bo flags isn't passed through wayland-drm protocl, how weston respect these flags?

[HalleyZhao]

Hi experts:when we create buffer object at wayland client side, there are some usage flags, for example gbm_bo_flags.but when we pass these buffer fd to weston through wayland-drm protocl, these flags are ignored.then, how weston respect these flags when using the buffer object?thanks.

    <!-- Create a wayland buffer for the prime fd.  Use for regular and planar         buffers.  Pass 0 for offset and stride for unused planes. -->    <request name="create_prime_buffer" since="2">      <arg name="id" type="new_id" interface="wl_buffer"/>      <arg name="name" type="fd"/>      <arg name="width" type="int"/>      <arg name="height" type="int"/>      <arg name="format" type="uint"/>      <arg name="offset0" type="int"/>      <arg name="stride0" type="int"/>      <arg name="offset1" type="int"/>      <arg name="stride1" type="int"/>      <arg name="offset2" type="int"/>      <arg name="stride2" type="int"/>    </request>
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