lsm: don't yet account for IMA in LSM_CONFIG_COUNT calculation

Since IMA is not yet an LSM, don't account for it in the LSM_CONFIG_COUNT
calculation, used to limit how many LSMs can invoke security_add_hooks().
Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
[PM: subject line tweak]
Signed-off-by: Paul Moore <paul@paul-moore.com>

security/security.c

@@ -44,7 +44,6 @@
 	(IS_ENABLED(CONFIG_SECURITY_SELINUX) ? 1 : 0) + \
 	(IS_ENABLED(CONFIG_SECURITY_SMACK) ? 1 : 0) + \
 	(IS_ENABLED(CONFIG_SECURITY_TOMOYO) ? 1 : 0) + \
-	(IS_ENABLED(CONFIG_IMA) ? 1 : 0) + \
 	(IS_ENABLED(CONFIG_SECURITY_APPARMOR) ? 1 : 0) + \
 	(IS_ENABLED(CONFIG_SECURITY_YAMA) ? 1 : 0) + \
 	(IS_ENABLED(CONFIG_SECURITY_LOADPIN) ? 1 : 0) + \