Dexopt service-statsd.

`service-statsd` is a jar that system_server loads dynamically. Such
jars can be dexopted now. This CL adds `service-statsd` to a
`systemserverclasspath_fragment`, which does not actually add the jar to
the classpath, but tells the build system to dexopt it.

NOTE: The corresponding `exported_systemserverclasspath_fragments` needs
to be added to the `prebuilt_apex` once a new prebuilt is dropped.

Bug: 203198541
Test: m com.android.os.statsd
Change-Id: I8c5df4102fdfca0b5b4820abbf63e3eedfa8f61f
Merged-In: I8c5df4102fdfca0b5b4820abbf63e3eedfa8f61f
Merged-In: I6a70eecd687743d5f888f000263e06d33a927126
2 files changed