Makefile: Globally enable fall-through warning

Now that all the fall-through warnings have been addressed in the
kernel, enable the fall-through warning globally.

Also, update the deprecated.rst file to include implicit fall-through
as 'deprecated' so people can be pointed to a single location for
justification.

Cc: Masahiro Yamada <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Michal Marek <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: [email protected]
Signed-off-by: Gustavo A. R. Silva <[email protected]>

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