Fix missing dev nodes in init_boot.img ramdisk

Previously ("Add null and console dev nodes to the Android initramfs")
introduced into init_boot.img the /dev/console and /dev/null nodes.
Sadly, it missed changing the release tools which are also generating
images in their own way.

Bug: 254835242
Change-Id: I4d2893ac24c09cf0d117422cbe2bde66083e7118