With the pmbootstrap change let's change the deviceinfo variable names
to the non-deprecated version.
[ci:ignore-count]
[ci:skip-build]: already built successfully in CI
The option `deviceinfo_flash_sparse_samsung_format` seems to work
fine on the xcover4lte.
Setting `deviceinfo_flash_sparse_samsung_format` to `1` (and
`deviceinfo_flash_sparse="true"`) causes heimdall to no longer hang
while the rootfs is being flashed.
[ci:skip-build]: already built successfully in CI
