Revert "Revert "Add gServiceSidMap.""

This reverts commit 8f21ad8aa6496e2ad6061589b87275f4a98ef651.

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: I771fa6bbeac0b9cbba5321881e191605b0e17e23
Merged-In: I771fa6bbeac0b9cbba5321881e191605b0e17e23
(cherry picked from commit 42bc6d55089566924dc367afa40280269b1d0419)
5 files changed