drm: Add old state pointer to CRTC .enable() helper function

The old state is useful for drivers that need to perform operations at
enable time that depend on the transition between the old and new
states.

While at it, rename the operation to .atomic_enable() to be consistent
with .atomic_disable(), as the .enable() operation is used by atomic
helpers only.

Signed-off-by: Laurent Pinchart <[email protected]>
Acked-by: Maxime Ripard <[email protected]> # for sun4i
Acked-by: Philipp Zabel <[email protected]> # for imx-drm and mediatek
Acked-by: Alexey Brodkin <[email protected]> # for arcpgu
Acked-by: Boris Brezillon <[email protected]> # for atmel-hlcdc
Acked-by: Liviu Dudau <[email protected]> # for hdlcd and mali-dp
Acked-by: Stefan Agner <[email protected]> # for fsl-dcu
Tested-by: Philippe Cornu <[email protected]> # for stm
Acked-by: Philippe Cornu <[email protected]> # for stm
Acked-by: Vincent Abriou <[email protected]> # for sti
Reviewed-by: Thomas Hellstrom <[email protected]> # for vmwgfx
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]

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