c/r: introduce CHECKPOINT_RESTORE symbol

For checkpoint/restore we need auxilary features being compiled into the
kernel, such as additional prctl codes, /proc/<pid>/map_files and etc...
but same time these features are not mandatory for a regular kernel so
CHECKPOINT_RESTORE config symbol should bring a way to disable them all at
once if one wish to get rid of additional functionality.

Signed-off-by: Cyrill Gorcunov <[email protected]>
Cc: Tejun Heo <[email protected]>
Cc: Andrew Vagin <[email protected]>
Cc: Serge Hallyn <[email protected]>
Cc: Vasiliy Kulikov <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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