Add Display P3 color mode

Bug: 32984164
Test: compile
Change-Id: Ic3f8e5ae840ad6de8d0dc416221098078d8a1b0f
diff --git a/include/system/graphics-base.h b/include/system/graphics-base.h
index 150301a..32b077a 100644
--- a/include/system/graphics-base.h
+++ b/include/system/graphics-base.h
@@ -111,6 +111,7 @@
     HAL_COLOR_MODE_DCI_P3 = 6,
     HAL_COLOR_MODE_SRGB = 7,
     HAL_COLOR_MODE_ADOBE_RGB = 8,
+    HAL_COLOR_MODE_DISPLAY_P3 = 9,
 } android_color_mode_t;
 
 typedef enum {