lakitu-arm64: revert root from vda3 back to sda3

To make ARM64 image more compatible with x86 one
revert back to using /dev/sda as a root device.

When booting in QEMU this requires switchig from
  -drive if=none,file=path/to/chromiumos_test_image.bin,id=hd0 \
  -device virtio-blk-device,drive=hd0
to:
  -device virtio-scsi-pci,id=scsi \
  -device scsi-hd,drive=hd,bootindex=0 \
  -drive if=none,id=hd,file=path/to/chromiumos_test_image.bin

BUG=b/175740674
TEST=running VMtest for lakitu-arm64
RELEASE_NOTE=None

Change-Id: I4448b531f42e7e6616629bc11d7822df650afcfd
Reviewed-on: https://cos-review.googlesource.com/c/cos/overlays/board-overlays/+/11911
Reviewed-by: Roy Yang <royyang@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
1 file changed