Add TLV755P*DBV LDO aliases

[awygle]

This adds the TLV755P LDO series SOT23-5/DBV parts from TI as a set of aliases to the TLV71209_SOT23-5 symbol.

Datasheet is http://www.ti.com/lit/ds/symlink/tlv755p.pdf

---

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

• Provide a URL to a datasheet for the symbol(s) you are contributing
• An example screenshot image is very helpful
• Ensure that the associated footprints match the official footprint library
• If there are matching footprint PRs, provide link(s) as appropriate
• Check the output of the Travis automated check scripts - fix any errors as required

[awygle]

I don't understand why the Travis script is calculating the center the way it is - based on my other experiences I would expect this to say the component is centered. If someone can offer advice on how to convince Travis I'll make those changes, otherwise I should probably revert the movement (but keep the pin offset change).

[evanshultz]

In general, the centering algorithm is rather weak (I seem to recall only pin locations are checked) and we often allow violations of this rule. Here is the existing symbol:

It's fine as it was. You can revert any movement changes.

And while you're at it: For completeness, can you add Low IQ, Small Size, to the description as in the datasheet title?

[awygle]

Done!

[evanshultz]

Thanks once again! Please keep the PRs coming!