drm: Add acquire ctx to ->gamma_set hook

Atomic helpers really want this instead of the hacked-up legacy
backoff trick, which unfortunately prevents drivers from using their
own private drm_modeset_locks.

Aside: There's a few atomic drivers (nv50, vc4, soon vmwgfx) which
don't yet use the new atomic color mgmt/gamma table stuff. Would be
nice if they could switch over and just hook up
drm_atomic_helper_legacy_gamma_set() instead.

Cc: Dave Airlie <[email protected]>
Cc: Alex Deucher <[email protected]>
Cc: Christian König <[email protected]>
Cc: Gerd Hoffmann <[email protected]>
Cc: Ben Skeggs <[email protected]>
Cc: Sinclair Yeh <[email protected]>
Cc: Thomas Hellstrom <[email protected]>
Cc: Eric Anholt <[email protected]>
Reviewed-by: Maarten Lankhorst <[email protected]>
Acked-by: Alex Deucher <[email protected]>
Reviewed-by: Sinclair Yeh <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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