SF: Add a RO flag for a new hal api for reporting hdcp level

Bug:285359126
Test: adb shell dumpsys SurfaceFlinger | grep hdcp -- verify flag shows
up default false.

Change-Id: Ibb82906313bd2b851d1681556d945ace373278f3
diff --git a/services/surfaceflinger/surfaceflinger_flags.aconfig b/services/surfaceflinger/surfaceflinger_flags.aconfig
index fec450e..a81f9b8 100644
--- a/services/surfaceflinger/surfaceflinger_flags.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags.aconfig
@@ -61,3 +61,12 @@
   bug: "303460805"
   is_fixed_read_only: true
 }
+
+flag {
+  name: "hdcp_level_hal"
+  namespace: "core_graphics"
+  description: "Feature flag for adding a HAL API to commuicate hdcp levels"
+  bug: "285359126"
+  is_fixed_read_only: true
+}
+