Revert "Include qcom/common/sepolicy"
CM has implemented this into device/oppo/msm8974-common and not in device/oppo/common
So we should better revert this one and use theirs

This reverts commit b7a399791a15aebb4ce532b27e501bd103f5d550.

Change-Id: Ia0f2784213c9a61e86f3cf14f53dc6b67cfa0f71