security: Convert LSM into a static interface

Convert LSM into a static interface, as the ability to unload a security
module is not required by in-tree users and potentially complicates the
overall security architecture.

Needlessly exported LSM symbols have been unexported, to help reduce API
abuse.

Parameters for the capability and root_plug modules are now specified
at boot.

The SECURITY_FRAMEWORK_VERSION macro has also been removed.

In a nutshell, there is no safe way to unload an LSM.  The modular interface
is thus unecessary and broken infrastructure.  It is used only by out-of-tree
modules, which are often binary-only, illegal, abusive of the API and
dangerous, e.g.  silently re-vectoring SELinux.

[[email protected]: cleanups]
[[email protected]: USB Kconfig fix]
[[email protected]: fix LSM kernel-doc]
Signed-off-by: James Morris <[email protected]>
Acked-by: Chris Wright <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: "Serge E. Hallyn" <[email protected]>
Acked-by: Arjan van de Ven <[email protected]>
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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