fingerprint: Allow devices to configure sensor location

This is a squash of the following changes:

Author: d34d <clark@cyngn.com>
Date:   2016-06-23 11:21:45 -0700

    fingerprint: Allow devices to configure sensor location

    The text for enrolling a fingerprint always assumes the sensor is
    located on the back.  This patch adds a config integer that defines
    where the sensor is located on the device.
      0 = back
      1 = front
      2 = left side
      3 = right side

    This patch also adds a new drawable that shows the front of the device
    when applicable.

    Change-Id: Ia8f5f8ff4ba4d13d35aed3052f60ff665dd4f294
    TICKET: CYNGNOS-3089

Author: Paul Keith <javelinanddart@gmail.com>
Date:   2018-01-26 22:23:03 +0100

    FingerprintEnrollFindSensor: Don't overlay front for side sensors

    * Both the base image and the base image + overlay are equally nonsense
      for devices with a side fingerprint scanner, but for those that overlay
      a custom fingerprint enrollment graphic, this image overlay wreaks havoc
    * Only set this overlay to be visible if the sensor is on the front, to
      allow devices with side sensors to only overlay the base image

    Change-Id: I7cbcea4830d4526cf9f7d139e7f84f21117fa9c4

Author: Michael W <baddaemon87@gmail.com>
Date:   Thu Jan 17 21:44:28 2019 +0100

    Settings: Make find fingerprint look great again

    * The current logic places the animation based on the size of
      the whole overlay instead of the image, which is a fixed-size png
    * Get the size of the image instead and place the dot relative to it
    * Also use "wrap_content" and add a padding to the top so the
      distance to the text is a fixed thing, not depending on how
      much space relative to the wanted space it actually takes

    * Preview: https://imgur.com/a/XanJ2aP

    Change-Id: I2bd08cee1abd1c6bad78ca1efc2189e573ded3cc

Change-Id: Ia8f5f8ff4ba4d13d35aed3052f60ff665dd4f294