build/create-image: fix grub install
build/create-image: fix grub install

In the commit 43dabd504951cc6e0e74a136f8ec23bf46651fdb,
a new condition has been introduced and device.map file was configured
even on Grub2.

Let's bring back this configuration to Grub1 only.

redhat-cip/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,enovance/edeploy,redhat-cip/edeploy,lebauce/edeploy,redhat-cip/edeploy,enovance/edeploy