wire bpf_base_test into netd_updatable_unit_test

The 3 pre-existing //system/netd tests are:
  TEST_F(BpfBasicTest, TestCgroupMounted)
  TEST_F(BpfBasicTest, TestTagSocket)
  TEST_F(BpfBasicTest, TestCloseSocketWithoutUntag)
which are directly related to BpfHandler.cpp implementation,
as it implements:
  Status BpfHandler::init(const char* cg2_path)
  BpfHandler::tagSocket()
  BpfHandler::untagSocket()

Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1c01ae90904faaea54b427495c7a5deab8b1b900

netd/Android.bp

@@ -63,6 +63,7 @@ cc_test {
     ],
     srcs: [
         "BpfHandlerTest.cpp",
+        "BpfBaseTest.cpp"
     ],
     static_libs: [
         "libnetd_updatable",
@@ -72,6 +73,7 @@ cc_test {
         "libcutils",
         "liblog",
         "libnetdutils",
+        "libprocessgroup",
     ],
     compile_multilib: "both",
     multilib: {