Camera: Add EFV public API flag

Add a dedicated flag for the EFV public APIs.

Bug: 297083874
Test: Successful build
Change-Id: Ie58d1daece322eba9beae290c1c0984d2b6f9a5e
diff --git a/camera/camera_platform.aconfig b/camera/camera_platform.aconfig
index c00e16e..47474ee 100644
--- a/camera/camera_platform.aconfig
+++ b/camera/camera_platform.aconfig
@@ -143,3 +143,11 @@
        purpose: PURPOSE_BUGFIX
      }
 }
+
+flag {
+     namespace: "camera_platform"
+     name: "concert_mode_api"
+     description: "Covers the eyes free videography public facing API"
+     bug: "297083874"
+}
+