Add brightness-related `TARGET_RECOVERY_UI_` properties

Bug: 221048336
Test: combined with the other CL in same topic, observed recovery
brightness updated correctly according to variables set in BoardConfig.

Change-Id: Iebad0753079414a5e11bce04008ee405c8d03580
diff --git a/core/Makefile b/core/Makefile
index 00ab3f8..a90ac89 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -2471,7 +2471,11 @@
     TARGET_RECOVERY_UI_PROGRESS_BAR_BASELINE:progress_bar_baseline \
     TARGET_RECOVERY_UI_TOUCH_LOW_THRESHOLD:touch_low_threshold \
     TARGET_RECOVERY_UI_TOUCH_HIGH_THRESHOLD:touch_high_threshold \
-    TARGET_RECOVERY_UI_VR_STEREO_OFFSET:vr_stereo_offset
+    TARGET_RECOVERY_UI_VR_STEREO_OFFSET:vr_stereo_offset \
+    TARGET_RECOVERY_UI_BRIGHTNESS_FILE:brightness_file \
+    TARGET_RECOVERY_UI_MAX_BRIGHTNESS_FILE:max_brightness_file \
+    TARGET_RECOVERY_UI_BRIGHTNESS_NORMAL:brightness_normal_percent \
+    TARGET_RECOVERY_UI_BRIGHTNESS_DIMMED:brightness_dimmed_percent
 
 # Parses the given list of build variables and writes their values as build properties if defined.
 # For example, if a target defines `TARGET_RECOVERY_UI_MARGIN_HEIGHT := 100`,