Expose COLOR_MODE_DISPLAY_BT2020.

Bug: 256551001
Test: build and flash; hidl-gen -L hash
android.hardware:hardware/interfaces
android.hardware.graphics.common@1.2::types >> current.txt

Change-Id: I33116c1b31bd981b04489bc9704a54e97332aed7
diff --git a/current.txt b/current.txt
index 146ded6..0fb8b49 100644
--- a/current.txt
+++ b/current.txt
@@ -931,5 +931,6 @@
 
 # ABI preserving changes to HALs during Android U
 2aa559cda86c358c6429114ef6bc72c1b43281e98f9eb6b4df5e7073c8d05767 android.hardware.automotive.vehicle@2.0::types
+42abd285a4293dadb8c89bc63b90cae2872fbffe90c4517aa3ea4965e8aecff7 android.hardware.graphics.common@1.2::types
 
 # There will be no more HIDL HALs. Use AIDL instead.
diff --git a/graphics/common/1.2/types.hal b/graphics/common/1.2/types.hal
index ebea1dc..07e9882 100644
--- a/graphics/common/1.2/types.hal
+++ b/graphics/common/1.2/types.hal
@@ -77,6 +77,8 @@
     HEIF = 0x1004,
 };
 
+@export(name="android_color_mode_v1_2_t", value_prefix="HAL_COLOR_MODE_",
+        export_parent="false")
 enum ColorMode : @1.1::ColorMode {
     /**
      * DISPLAY_BT2020 corresponds with display settings that implement the ITU-R