Multiple LEDs [1/2]: Remove feature support

 * The feature was used only on Huashan since 2015

 * It serves only for a small part of the users
    who wanted to restrict to one light instead
    of three lights from the LEDs bar

 * Due to Oreo's new HIDL interfaces stack,
    the additional data holder would need
    a custom lights interface which is useless
    for a single device and a rare use case

 * Reverts the original Settings commit:
    "Multiple LEDs [2/3]: Illumination Bars support"
   I5531093cd0543d7730a8c3f83c0aebb3678436d5

Change-Id: I1997b9723bb6eb702e35d93886135ebbe35b360e
Signed-off-by: Adrian DC <radian.dc@gmail.com>