image_to_vm: Change cp to dd commands with progress for debuging.

image_to_vm.sh is hanging in the CQ for betty and lakitu during the cp
operations. This replaces those with dd ... status=progress operations
to get more information about where/how the hang is occuring.

BUG=chromium:957712
TEST=preCQ passes

Change-Id: I706f80bb9976e5bfe9cc1d7242fdc241d0c1d811
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosutils/+/1655099
Reviewed-by: Allen Webb <allenwebb@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Tested-by: Allen Webb <allenwebb@google.com>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Commit-Queue: Allen Webb <allenwebb@google.com>
1 file changed