In the default design, every time we change the brightness
in torch node it gets reflected only when the enable bit
in the switch node is toggled from 0 to 1. Add new DT property
to optionally allow brightness change to reflect in realtime,
for as long as the switch node enable bit remains set.
Change-Id: I0bc339ba2488177fff144b2771e9a8db425ced84
Signed-off-by: Kavya Nunna <quic_knunna@quicinc.com>