Reverts commit 70efe55031 for kernels that
started failing on bpo. I suspect it's caused by a change in binutils,
since I tried building linux-oneplus-billie2 with gcc6 and got the same
error (after trying other workarounds like disabling selinux for it, but
then it failed elsewhere).
So far the debug-shell in initfs works. The device uses dynamic
partitions, so that has to be figured out to get a proper rootfs.
One thing to look out for is that mount_subpartitions task in initfs
hangs, so pmos_boot=sth was added to kernel cmdline to skip it. This is
also related to dynamic partitions, anyway.
[ci:skip-build] Already built on CI
