Mark libhidlallocatorutil as double_loadable

libhidlallocatorutil is a VNDK lib and also used by LLNDK(libmediandk)
which means this lib can be double-loaded.

deps:
- libmediandk -> libmedia_jni -> libhidlallocatorutils

Bug: 121280180
Test: m -j
Change-Id: I75e45847e2e1834738b91839d70aa7d520fd17bc
diff --git a/transport/allocator/1.0/utils/Android.bp b/transport/allocator/1.0/utils/Android.bp
index b1a3f41..9f70963 100644
--- a/transport/allocator/1.0/utils/Android.bp
+++ b/transport/allocator/1.0/utils/Android.bp
@@ -18,6 +18,7 @@
     vndk: {
         enabled: true,
     },
+    double_loadable: true,
     defaults: ["libhidl-defaults"],
     shared_libs: [
         "libbinder",