sepolicy: Revert custom sdcardfs policy in favor of AOSP

 * Upstream policy showed up in AOSP this morning. Dropping
   ours in favor of AOSP.

Revert "sepolicy: A few more denials"

This reverts commit 522c421f.

Revert "sepolicy: More policy for sdcardfs"

This reverts commit 4a24ffeb.

Revert "sepolicy: Add sdcardfs support"

This reverts commit ba87877d.

Change-Id: I4f066b9bd5d8c899137fcaa12999f2547f9e0ec0