Multiple LEDs [2/2]: 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

Change-Id: Ie08a1d625c7ce00fefff5bc1159522207be69dbc
Signed-off-by: Adrian DC <radian.dc@gmail.com>