Add libbt_packets build target without apex

* After setting apex_available for BT, it cannot be installed to
  platform(vendor) without adding //apex_available:platform.
* However, adding //apex_available:platform will require a change
  to packages/modules/common/build/allowed_deps.txt.

Test: m
Test: gd/cert/host
Tag: #refactor
Bug: 234325362
Ignore-AOSP-First: Cherry-picked from AOSP
Merged-In: I7bc9d660d7d91363c35ef3b9e1aed5759ffb7215
Change-Id: I7bc9d660d7d91363c35ef3b9e1aed5759ffb7215