selinux: drop SECURITY_SELINUX_POLICYDB_VERSION_MAX

Remove the SECURITY_SELINUX_POLICYDB_VERSION_MAX Kconfig option

Per: https://github.com/SELinuxProject/selinux/wiki/Kernel-Todo



This was only needed on Fedora 3 and 4 and just causes issues now,
so drop it.

The MAX and MIN should just be whatever the kernel can support.

Signed-off-by: William Roberts <william.c.roberts@intel.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>