nxpmicro-mfgtools: init at 1.3.191

Add nxpmicro-mfgtools to nixpkgs

From the project's homepage [1]:

    Freescale/NXP I.MX Chip image deploy tools.

The project's only binary and library at the moment is UUU. NXP
might add more in the future, so making the package name:

    nxpmicro-mfgtools

instead of:

    nxp-uuu

or something similar.

[1]: https://github.com/NXPmicro/mfgtools