Refactor staticlibs

This CL introduces net-utils-framework-connectivity, net-utils-tethering
and net-utils-service-connectivity as staticlibs.

- net-utils-framework-connectivity will be used by
  framework-connectivity-pre-jarjar.
- net-utils-service-connectivity and net-utils-tethering are the
  static liraries used by service-connectivity-pre-jarjar and Tethering
  respectively.

Bug: 350699020
Test: CI

Change-Id: I4dbb2b0de905a576cfcf24d2d5d1f1a261d2bd68

Tethering/Android.bp

@@ -69,13 +69,7 @@ java_defaults {
         "android.hardware.tetheroffload.control-V1.0-java",
         "android.hardware.tetheroffload.control-V1.1-java",
         "android.hidl.manager-V1.2-java",
-        "net-utils-framework-common",
-        "net-utils-device-common",
-        "net-utils-device-common-bpf",
-        "net-utils-device-common-ip",
-        "net-utils-device-common-netlink",
-        "net-utils-device-common-struct",
-        "net-utils-device-common-struct-base",
+        "net-utils-tethering",
         "netd-client",
         "tetheringstatsprotos",
     ],