Add tethering bootclasspath fragment to its sdk

This subsumes the java_sdk_library in the sdk.

Bug: 188427719
Test: build_mainline_modules.sh
Change-Id: Ib2ebb3893135b4dd91812f1f1b0915540cfd64cb
Merged-In: Ib2ebb3893135b4dd91812f1f1b0915540cfd64cb
(cherry picked from commit 3669599dec09af051e01123370eb399f4d9ffc37)
1 file changed