Revert "Revert "ACL based on getCallingSid""

This reverts commit 17ef8885d95fbd683ef628190274960aea63e625.

This enables getting security contexts from the kernel.

Bug: 121035042
Test: boot patch w/ w/o kernel patch on cuttlefish and check for
    security logs.
Test: check for cnd failures on crosshatch.

Change-Id: I79856555937d0d367e2d00f0155d98bd7fcb260e
7 files changed