4.12 release notes: Add some explanation behind deprecations

Some features are made mandatory, meaning that some platforms have
been dropped from master. This also explains that further development
on these popular platforms can happen on the 4.11 branch.

TODO is this really the right place or is it too technical for release
notes?

Change-Id: I95e01c301e7db6f81ef88a89d709ebab35c9ccfb
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37064
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-by: David Hendricks <david.hendricks@gmail.com>

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