build: Fix global selinux policy inclusion

We're adding specific policies to an overlay instead of patching
external/sepolicy, so we need to make sure it's included to prevent
misbehaving systems

Change-Id: I7989a1093f9abc8360d492e73a860eb4afad10ad
build: Fix global selinux policy inclusion

We're adding specific policies to an overlay instead of patching
external/sepolicy, so we need to make sure it's included to prevent
misbehaving systems

Original commit here:
https://github.com/AOKP/build/commit/c3914bc2ba02b01b829552ec04901a2cb42826c6

Change-Id: Ic281d211e4738479aed4a64de47e5132e5b709e0
Signed-off-by: iceandfire <arhamjamal@gmail.com>