NBMController should load DDC data on creation

HBMController loads DDC in constructor, NBMController sholud do the same
(otherwise there will be no lux throttling data before onDisplayChange
event)
Please note, Clampers already handing it properly see where
BrightnessClampersController is constructed.

Bug: b/277877293

Test: hardcode DisplayDeviceConfig.mLuxThrotllingData,
use adb shell dumpsys display to verify that
NBMController.mBrightnessLimits is set

Change-Id: I16a31665d963ab0917c4f7be173134b37e0613e7