adb: `adbd` uses shared libraries.

This CL builds the former `libadbd` as a shared library, and moves
`adbd` to using shared libraries.

We can't switch `libadbd` from static to shared library directly, due to
the circular dependency between `libadbd` and `adbd`. In particular,
daemon_service_to_fd() can't be compiled into `libadbd`, as it needs to
be overridden by recovery/minadbd.

This CL creates a static library `libadbd_core` as the common base,
which contains everything from the former `libadbd`. Both of the two
shared library targets `libadbd` and `libadbd_services` depend on
`libadbd_core`.

The `adbd` on device (under both of normal boot and recovery) now
depends on `libadbd.so` and `libadbd_services.so`. recovery/minadbd will
depend on `libadbd.so` and `libminadbd_services.so` in future (after
fully converting recovery to Soong).

Bug: 78793464
Test: `m dist`
Test: Run adbd_test on marlin.
Test: Build and flash marlin on device. Check basic adbd functionalities
      (`adb shell` and `adb sync`) under normal boot and recovery.
Test: `adb sideload` on marlin.
Change-Id: Iacbd4db524ef94abd175cd1d27688f4faf3db024