[feature suggestion] provide PARTUUID as designation for ROOT_DEV
If the system is booted from another drive other than the eMMC the
ROOT_DEV has to be changed but is currently limited only to the
/dev/sdX designation set by the kernel, which in case of multiple hard drives being connected could vary.
root=PARTUUID= which makes it independent of the kernel's
/dev/sdX designation and thus I trust it would be handy for
schnapps being able to set the
PARTUUID= as well.