integrity: move ima inode integrity data management

Move the inode integrity data(iint) management up to the integrity directory
in order to share the iint among the different integrity models.

Changelog:
- don't define MAX_DIGEST_SIZE
- rename several globally visible 'ima_' prefixed functions, structs,
  locks, etc to 'integrity_'
- replace '20' with SHA1_DIGEST_SIZE
- reflect location change in appropriate Kconfig and Makefiles
- remove unnecessary initialization of iint_initialized to 0
- rebased on current ima_iint.c
- define integrity_iint_store/lock as static

There should be no other functional changes.

Signed-off-by: Mimi Zohar <zohar@us.ibm.com>
Acked-by: Serge Hallyn <serge.hallyn@ubuntu.com>

security/security.c

@@ -16,6 +16,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/security.h>
+#include <linux/integrity.h>
 #include <linux/ima.h>
 
 #define MAX_LSM_XATTR	1
@@ -336,7 +337,7 @@ int security_inode_alloc(struct inode *inode)
 
 void security_inode_free(struct inode *inode)
 {
-	ima_inode_free(inode);
+	integrity_inode_free(inode);
 	security_ops->inode_free_security(inode);
 }