Add preinstalled partition to seinfo

Bug: 280547417
Test: boot pixel and cuttlefish
Test: atest SELinuxMMACTest
Change-Id: I0b407ad8b95278453d5b917e0da7024b245062b9
Merged-In: I0b407ad8b95278453d5b917e0da7024b245062b9
1 file changed