mars: overlay: also set config_screenBrightnessDozeFloat

The PowerManagerService reads config_screenBrightnessDozeFloat first
and later falls back to config_screenBrightnessDim if the float
value is INVALID_BRIGHTNESS_IN_CONFIG [1]. The problem is that
config_screenBrightnessDozeFloat is set to 0.0 by default on the
frameworks side [2], so it will never be INVALID_BRIGHTNESS_IN_CONFIG.

As a result, mScreenBrightnessDoze is always initialized to 0.0f
if the device does not set config_screenBrightnessDozeFloat in an
overlay, which then causes BRIGHTNESS_CONSTRAINT_TYPE_DOZE to
always return 0.0f.

To prevent other framework components from getting an incorrect
doze config value, set this float in overlay as well.

[1] https://android.googlesource.com/platform/frameworks/base/+/refs/tags/android-12.1.0_r10/services/core/java/com/android/server/power/PowerManagerService.java#991
[2] https://android.googlesource.com/platform/frameworks/base/+/refs/tags/android-12.1.0_r10/core/res/res/values/config.xml#1333



Change-Id: If79a05c167aff39b38e234fea906cb7bbeed6381
Signed-off-by: Chenyang Zhong <zhongcy95@gmail.com>