deployagent: set sdk version.

Not specifying a platform version in a java binary will result in code
generation tools being built to create framework.jar, which currently
fails when building with BUILD_HOST_static=1.

Specify an SDK version to avoid this.

Bug: http://b/142536936
Test: m -j adb BUILD_HOST_static=1
Change-Id: Ifb9556c7c6cc43417c3f56137edee21f145f8b17