security: switched to stackable model for PFT/PFK module

Moved hooks from SELINUX framework to general SECURITY framework

Change-Id: I37e701b4925c4993f724c32b258c5088f4dcbe4d
Signed-off-by: Andrey Markovytch <andreym@codeaurora.org>
Signed-off-by: Yang Guang <guyang@codeaurora.org>