Use the R API statsd library on R NetworkStack

Using the Q library causes parse errors for stats, as that library is
not forward-compatible with R. The R library is backwards-compatible
with Q and should be used on R builds.

Bug: 160656765
Test: statsd_testdrive on device with an updated NetworkStack
Change-Id: Idf3e654a679ab31d0d3c3d960f9745387edbbe4a