WIP: d3d12: NV12 resource support with YV12 emulation

Repurposing this MR just for the modifier patch for YV12 emulation, WIP based on !14123 (merged)

The gralloc we're looking to use for WSA implements YV12 by allocating a D3D NV12 resource, and [de-]interleaving the UV plane(s) on [un]lock. It needs to report that the resource contains 3 planes, so a nonzero modifier is used to allow DRI to import NV12 with 3 fds, and we just ignore the third one. This is probably pretty hacky and I'm open to better ways to do this.