Enable native_bridge_support for libsync

Android build system added support for building translated binaries
used on natively bridged targets (arm on x86 for example).

However in order to avoid building unnecessary binaries and libraries
for such architectures most modules do not support native bridge by default.

All needed modules have to explicitly indicate if they may be used as part
of translated binary build.

This change enabled native bridge support for libsync because it is a
public library.

Bug: http://b/77159578
Test: make
Change-Id: I993384469fa2b011a15a2ecb1fd2162184c74a47