hook-functions/init/scripts/local: add support for ubifs.

MODULES=dep fails when / is ubifs. This patch adds support for
something like root=ubi0:rootfs when ubi is modular.

Quoting Martin:

    It essentially does three things:
     - adds the correct modules to the ramdisk (for MODULES=dep and MODULES=most)
     - reads ubi.mtd= from the command line
     - loads ubi with the ubi.mtd info and ignores the "Waiting for root" check

    I've successfully tested this with a kernel with modular ubi and with
    the following boot variants:
      console=ttyS0,115200 ubi.mtd=2 root=ubi0:rootfs rootfstype=ubifs
      console=ttyS0,115200 ubi.mtd=2 root=ubi0_0 rootfstype=ubifs

    With
      console=ttyS0,115200 ubi.mtd=2 root=/dev/ubi0_0 rootfstype=ubifs
    I get an error that it cannot mount root but I suspect this is an
    ubifs error and has nothing to do with i-t (since at this point I can
    manually mount it with -t ubifs ubi0_0 whereas the /dev/ variant
    doesn't work).

    Tested with MODULES=dep and MODULES=most as well as with a kernel that
    has ubifs built in.

Closes: #582858
Thanks: Martin Michlmayr <tbm@cyrius.com>
Signed-off-by: Martin Michlmayr <tbm@cyrius.com>
Reviewed-by: Michael Prokop <mika@debian.org>

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