frameworks/base: Lights notifications brightness support

Author: AdrianDC <radian.dc@gmail.com>
Date:   Tue, 18 Aug 2015 19:33:18 +0200

    Implement the support of an overall brightness control for the LEDs.

    The setting is deactivated by default
    and will be ignored by the unimplemented phones.
    Current LibLights will simply not use the new variable.

    Changes includes :
      frameworks/base
      packages/Apps/Settings

    Change-Id: I1c0de01b1c6a2a2cf1432028a2e69f90b2373b2c
Signed-off-by: AdrianDC <radian.dc@gmail.com>

Author: Adnan Begovic <adnan@cyngn.com>
Date:   Mon, 9 Nov 2015 16:26:00 -0800

    fw: Move battery light settings to CMSettings.

    Change-Id: I28e60473356b2a9af152df82d34ad7abc9918682

Author: Adrian DC <radian.dc@gmail.com>
Date:   Sat Oct 14 23:08:47 2017 +0200

    fw: Rebrand to LineageOS and cleanup for Android Oreo

    Change-Id: I845f866891386aee808a4e7e80f4ab7c3ad48830

Author: Gabriele M <moto.falcon.git@gmail.com>
Date:   Mon, 31 Aug 2015 19:38:16 +0100

    Let liblights adjust the brightness of LEDs while previewing it

    Each device might use the information about the brightness of LEDs
    in a unique way. Currently the slider to adjust the brightness of
    LEDs is using an already scaled RGB color to preview the intensity
    of the light. Instead of doing this, use a white colored light and
    add to it the information about the brightness.

    Change-Id: I4dd35944debc744ea6c7f1fcc5dd7a909e8863fa

Author: AdrianDC <radian.dc@gmail.com>
Date:   Wed, 11 Nov 2015 21:06:22 +0100

    LEDs Brightness: Update the slider for M

     * Add notification details needed for M
     * Sync with some changes made in the Display Brightness dialog
     * Clean ic_settings indents with Settings ic_settings_24dp.xml

    Change-Id: I8b6ac1920704f43f4776cbd3bdfb3d0ed8d223dc
Signed-off-by: AdrianDC <radian.dc@gmail.com>

Change-Id: I1c0de01b1c6a2a2cf1432028a2e69f90b2373b2c