dm: MIGRATION: Add migration plan for CONFIG_SATA

dm: MIGRATION: Add migration plan for CONFIG_SATA

As the core of the subsystem has been converted along with some of the
drivers, formalize a deadline for migration.

Cc: Akshay Bhat <[email protected]>
Cc: Andreas Geisreiter <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: Christian Gmeiner <[email protected]>
Cc: Fabio Estevam <[email protected]>
Cc: Jason Liu <[email protected]>
Cc: Ken Lin <[email protected]>
Cc: Ludwig Zenz <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Max Krummenacher <[email protected]>
Cc: Nikita Kiryanov <[email protected]>
Cc: Otavio Salvador <[email protected]>
Cc: Peng Fan <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Cc: Soeren Moch <[email protected]>
Cc: Stefan Roese <[email protected]>
Cc: Stefano Babic <[email protected]>
Cc: Tim Harvey <[email protected]>
Cc: Troy Kisky <[email protected]>
Cc: Tuomas Tynkkynen <[email protected]>
Cc: York Sun <[email protected]>
Signed-off-by: Tom Rini <[email protected]>