Sandrine Bailleux 47801a6985 docs: extend deprecation policy
Our process documentation already mentions that if a platform is no
longer maintained, it is best to deprecate it to keep the project's
source tree clean and healthy.

The same argument stands for drivers or library interfaces so extend
this policy to those.

Signed-off-by: Sandrine Bailleux <sandrine.bailleux@arm.com>
Change-Id: Ieb235d6a1fb089343e0e1e3e5f36067552f2f8f0
2023-04-24 13:45:44 +02:00
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