hwcontext_vaapi: Use PRIME_2 memory type for modifiers.

This way we can pass explicit modifiers in. Sometimes the
modifier matters for the number of memory planes that
libva accepts, in particular when dealing with
driver-compressed textures. Furthermore the driver might
not actually be able to determine the implicit modifier
if all the buffer-passing has used explicit modifier.
All these issues should be resolved by passing in the
modifier, and for that we switch to using the PRIME_2
memory type.

Tested with experimental radeonsi patches for modifiers
and kmsgrab. Also tested with radeonsi without the
patches to double-check it works without PRIME_2 support.

v2:
  Cache PRIME_2 support to avoid doing two calls every time on
  libva drivers that do not support it.

v3:
  Remove prime2_vas usage.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

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