Move vendor_sched to common sepolicy

Previously vendor_sched is put under product area which will be replaced
by GSI. To solve it, move it to system/sepolicy.

Bug: 194656257
Test: build pass
Change-Id: I15801c0db0a8643cac2a2fc1f004db6fb21050dc
Merged-In: Ia0b855e3a876a58b58f79b4fba09293419797b47
6 files changed