soong_config: Add TARGET_USES_MEDIA_EXTENSIONS variable

* Soong product variable 'uses_media_extensions'

Change-Id: Icf36c7e4a90ace7a4c603c63ab1126c1554ffab8
Signed-off-by: Adrian DC <radian.dc@gmail.com>
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 20294a7..08a30ba 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -3,8 +3,13 @@
 	Has_legacy_camera_hal1 struct {
 		Cflags []string
 	}
+
+	Uses_media_extensions struct {
+		Cflags []string
+	}
 }
 
 type ProductVariables struct {
 	Has_legacy_camera_hal1  *bool `json:",omitempty"`
+	Uses_media_extensions   *bool `json:",omitempty"`
 }