Camera: Add flag for zoom method metadata tag

If zoom method is ZOOM_RATIO, the camera device makes
sure the effective zoom is reflected in zoom_ratio.

Flag: com.android.internal.camera.flags.zoom_method
Test: atest CtsCameraTestCases
Bug: 350076823
Change-Id: Ida5621e471d9c50f4a441d030060cf437b673520
diff --git a/camera/camera_platform.aconfig b/camera/camera_platform.aconfig
index a03ccf5..774d21c 100644
--- a/camera/camera_platform.aconfig
+++ b/camera/camera_platform.aconfig
@@ -218,3 +218,11 @@
     description: "Indicates when to activate Night Mode Camera Extension"
     bug: "335902696"
 }
+
+flag {
+    namespace: "camera_platform"
+    name: "zoom_method"
+    is_exported: true
+    description: "Gives apps explicit control on reflects zoom via ZOOM_RATIO capture result"
+    bug: "298899993"
+}