[ET][jni] Provide opt-out config for vulkan backend dependency

Pull Request resolved: #15682

## Context

IGVR can't use downloadable modules so an opt out path is required to avoid regressing APK size from including the vulkan backend.
ghstack-source-id: 322121420
@exported-using-ghexport

Differential Revision: [D86547777](https://our.internmc.facebook.com/intern/diff/D86547777/)

Author: ssjia

extension/android/BUCK

@@ -22,9 +22,10 @@ non_fbcode_target(_kind = fb_android_library,
     language = "JAVA",
     deps = [
         "//fbandroid/java/com/facebook/jni:jni",
-        "//xplat/executorch/backends/vulkan:vulkan_backend_lib_static",
         "//fbandroid/libraries/soloader/java/com/facebook/soloader/nativeloader:nativeloader",
-    ],
+    ] + ([
+        "//xplat/executorch/backends/vulkan:vulkan_backend_lib_static",
+    ] if read_config("executorch", "minimal_jni", "false") == "false" else []),
 )
 
 non_fbcode_target(_kind = fb_android_library,

extension/android/jni/BUCK

@@ -66,8 +66,9 @@ non_fbcode_target(_kind = fb_android_cxx_library,
         "//xplat/executorch/extension/runner_util:inputs_static",
         "//xplat/executorch/extension/tensor:tensor_static",
         "//xplat/executorch/kernels/quantized:generated_lib_static",
+    ] + ([
         "//xplat/executorch/backends/vulkan:vulkan_backend_lib_static",
-    ],
+    ] if read_config("executorch", "minimal_jni", "false") == "false" else []),
 )
 
 non_fbcode_target(_kind = fb_android_cxx_library,