Allow FMQ to be double-loaded

libfmq is a shared library. When it is included by an NDK library, it
produces the following error message:

module "libneuralnetworks" variant "android_arm64_armv8-2a_kryo385_core_static":
links VNDK library "libfmq" that isn't double loadable (not also LL-NDK,
VNDK-SP, or explicitly marked as 'double_loadable').

This CL allows FMQ to be double-loaded, enabling it to be used by NDK
libraries.

Test: mma
Change-Id: I421eb7a9e4b969f1f3ef415bd580a42ac8e747bb