colibri_vf: extend environment

Newer UBI implementation do not allow small UBI partitions since
the amount of bad blocks is now calculated by the size of the MTD
partition (instead volume size). On small partitions, this leads
to UBI partitions only consisting of reserved blocks. Therefor we
now use only one volume, which also allows better wear leveling
and bad block management.

Since it is needed to attach the whole UBI partition, mounting
the UBI filesystem would be a good option. Measurement showed that
the overhead reading from UBI filesystem compared to read from
a UBI volume is minimal (below 100ms).

Furthermore, this also adds support to load device trees for newer,
device tree based kernels. By setting the variable fdt_board, the
scripts read the FDT file and try to pass this to the kernel. The
FDT file will be concatinated:
${soc}-colibri-{fdt_board}.dtb

E.g. when fdt_board is set to "eval-v3", the scripts will load the
device tree file "vf610-colibri-eval-v3.dtb" on a Colibri VF61.

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