Add missing aconfig container field to vendor/widevine/libwvdrmengine

Bug: 330354107
Test: CI

Flag: NONE

Ignore-AOSP-First: It is easier to detect all the mismatch in internal
master.

Change-Id: Ib7f679e34521afcee7fae648415315f4cbab91d6
(cherry picked from commit a6f7ac137ca1ab00985c1eb8b3e96a647a5d8400)

libwvdrmengine/aconfig/Android.bp

@@ -15,6 +15,7 @@
 aconfig_declarations {
     name: "wv_media_drm_flags",
     package: "com.android.mediadrm.widevine.flags",
+    container: "vendor",
     srcs: [
         "wv_media_drm_flags.aconfig",
     ],

libwvdrmengine/aconfig/wv_media_drm_flags.aconfig

@@ -1,4 +1,5 @@
 package: "com.android.mediadrm.widevine.flags"
+container: "vendor"
 
 flag {
   name: "update_cdm_version_to_18_0_2"