Create TPS22976

[eclecticc]

http://www.ti.com/lit/ds/symlink/tps22976.pdf

Note that VIN and VOUT are passive because they can actually be connected backwards for use in reverse current blocking.

Replace this line with your commit message! Please provide a description of your pull request

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All contributions to the kicad library must follow the KiCad library convention

Thanks for creating a pull request to contribute to the KiCad libraries! To speed up integration of your PR, please check the following items:

• [x] Provide a URL to a datasheet for the symbol(s) you are contributing
• [x] An example screenshot image is very helpful
• [x] Ensure that the associated footprints match the official footprint library
  • A new fitting footprint must be submitted if the library does not yet contain one.
• [x] If there are matching footprint PRs, provide link(s) as appropriate
• [x] Check the output of the Travis automated check scripts - fix any errors as required
• [x] Give a reason behind any intentional library convention rule violation.