Move libstatssocket to shared.

This fixes the boot loop when zygote tries
to log to statsd during boot time.

Linking libstatssocket statically from two different places
causes translation errors resulting in multiple instances of the
same struct being created. This meant that the struct is no longer
shared across the same process for opening/closing of the socket.

Bug: 149889582
Test: Phone boots
Change-Id: Ibfa25c0fe7874ba08157a5ec43601c5cf8305723