panfrost: Support modifiers (share framebuffers as 16x16 u-interleaved tiling)

Both as an intermediate step to sharing buffers as AFBC and as an end in itself (notably for T720, which predates AFBC), let's add modifier support capable of sharing wayland egl clients tiled.

Cc @anarsoul @yuq825 for the final commit adding the modifier to dri, please test that one-line change against lima.