ARM: tegra: use numeric versioning for p2771-0000

ARM: tegra: use numeric versioning for p2771-0000

The board ID EEPROM and board ID stickers on p2771-0000 will use a numeric
versioning scheme, with version numbers such as 000/100/200/300/400/500.
Within NVIDIA, these versions are also known as A00/A01/A02/A03/A04/B00.
However, that numbering scheme is not easily visible outside of NVIDIA,
and so does not make much sense to use. Convert U-Boot to use the readily
visible numeric scheme.

Also, it turns out that the current A02 DT actually applies to board
versions 000/100/200 (A00..A02). Consequently rename this to 000 not 200
so that all U-Boot builds are named after the first version of the HW they
support.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>