drm/fourcc: Add a alpha field to drm_format_info

There's a bunch of drivers that duplicate the same function to know if a
particular format embeds an alpha component or not.

Let's create a field in the drm_format_info to avoid duplicating that logic
and looking up formats all the time.

Cc: Eric Anholt <[email protected]>
Cc: Inki Dae <[email protected]>
Cc: Joonyoung Shim <[email protected]>
Cc: Kyungmin Park <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Mark Yao <[email protected]>
Cc: Seung-Woo Kim <[email protected]>
Reviewed-by: Boris Brezillon <[email protected]>
Reviewed-by: Daniel Vetter <[email protected]>
Signed-off-by: Maxime Ripard <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/9cd9951d147ff810c1f6f68d79e7983361ed6b68.1516617243.git-series.maxime.ripard@free-electrons.com

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