Refactor the parsing of seinfo am: 7fd89c00f7 am: c4b477c1de am: f87183c61b

Original change: https://android-review.googlesource.com/c/platform/external/selinux/+/2836178

Change-Id: I40a776d1e79ab6927464cb1bd5a5b612cd5c2292
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>