security: Drop unnecessary prefix from LSM security pointer

Reported-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>
security: Simplify naming of kdbus' send and receive hooks

Reported-by: Paul Moore <pmoore@redhat.com>
Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>
security: Simplify naming of kdbus' alloc and free hooks too

These functions make sense only in 'struct security_ops'
anyway, so there is no need for '_security' postfix.

Signed-off-by: Karol Lewandowski <k.lewandowsk@samsung.com>