Temporarily disable wearable system services.

Wearable system service code has been disabled due to compile issues. We
need to temporarily disable these services in system server to unblock
system bring up.

Bug: 191419780
Bug: 191493915
Fix: 191493915
Fix: 191419780

Test: class not found error is gone.
Change-Id: I177f04ff1ff5b43c242367d9741e829550ed8e36