Reverts change to force use of 5.10; 5.15 is now available.

Also removes now-nonexistent boot images from the fetch pattern,
and replaces references to "ramdisk" with "bootimg" since GKI
on Android T+ no longer uses ramdisk (boot.img contains only kernel).

Bug: 234483899
Test: Use to create a repacked T partner GKI build
Change-Id: Iba664a3ee72df1d7bd6a77cbcb86b76a63c88646
2 files changed