Include partition-split selinux_policy modules.

The selinux_policy module has been split in two, so that the system
artifacts can be included separately. Also remove associated whitelist
entries.

Bug: 80410283
Test: for t in eng userdebug user; do lunch mainline_arm64-${t}; m nothing; done
Change-Id: Id704c907b1ed31ae49697d33f075c013bc3dfc8c
Merged-In: Id704c907b1ed31ae49697d33f075c013bc3dfc8c